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MW3 Downgrade and Update Prevention Guide

Scheduled Pinned Locked Moved MW3 Client Support
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  • Salivaboi
    Salivaboi
    Salivaboi
    wrote on last edited by
    #3

    Life saver

    1 Reply Last reply
    1
    • Grubs.gg Grubs.gg referenced this topic on
    • Delta_1453
      Delta_1453
      Delta_1453
      wrote on last edited by
      #4
      This post is deleted!
      1 Reply Last reply
      0
      • espresso8031
        espresso8031
        espresso8031
        wrote on last edited by
        #5

        If anybody runs into some script errors in private mp matches like I did, using different manifests solved it for me

        download_depot 42680 42682 2661317971072643596 
        download_depot 42680 42683 1595601894688570808 
        download_depot 42680 42681 5651167211650965131 
        download_depot 42690 42691 4104640605720756125 
        

        please remember to clear your plutonium iw5 cache.

        All credit goes to discord users Fry and Raine! Hope this helps someone.

        SkUlLcRaCkErgd 5persondude 2 Replies Last reply
        3
        • blitzou
          blitzou
          blitzou
          wrote on last edited by blitzou
          #6

          Life saver as well! Thanks for the detailed tutorial. Now facing the same problem like this ticket to launch on a private game : https://forum.plutonium.pw/topic/46474/anyone-able-to-assist-please

          Vipadus 1 Reply Last reply
          1
          • candy2
            candy2
            candy2
            wrote on last edited by
            #7
            This post is deleted!
            1 Reply Last reply
            0
            • blitzou blitzou referenced this topic on
            • blitzou blitzou

              Life saver as well! Thanks for the detailed tutorial. Now facing the same problem like this ticket to launch on a private game : https://forum.plutonium.pw/topic/46474/anyone-able-to-assist-please

              Vipadus
              Vipadus
              Vipadus
              wrote on last edited by
              #8

              blitzou Check the post by espresso8031 right above yours. I had the exact same error and all I did was uninstall MW3 and Plutonium, then redid the downgrade process except with those depot files.

              1 Reply Last reply
              0
              • Grubs.gg Grubs.gg referenced this topic on
              • Benson774
                Benson774
                Benson774
                wrote on last edited by
                #9

                was able to download the first two but not the third (42751)
                Screenshot 2026-09-10 160637.png

                1 Reply Last reply
                0
                • Benson774
                  Benson774
                  Benson774
                  wrote on last edited by
                  #10

                  update: Grok made me swap 42751 with 42750 and apparently it worked. then i followed the rest of the procedure and now i can play MW3 (it wouldn't run before the downgrade)
                  Screenshot 2026-09-10 162223.png

                  1 Reply Last reply
                  0
                  • espresso8031 espresso8031

                    If anybody runs into some script errors in private mp matches like I did, using different manifests solved it for me

                    download_depot 42680 42682 2661317971072643596 
                    download_depot 42680 42683 1595601894688570808 
                    download_depot 42680 42681 5651167211650965131 
                    download_depot 42690 42691 4104640605720756125 
                    

                    please remember to clear your plutonium iw5 cache.

                    All credit goes to discord users Fry and Raine! Hope this helps someone.

                    SkUlLcRaCkErgd
                    SkUlLcRaCkErgd
                    SkUlLcRaCkErgd
                    wrote on last edited by
                    #11

                    espresso8031 do I install these with the ones above or just the four in your comment?

                    1 Reply Last reply
                    0
                    • 5persondude
                      5persondude
                      5persondude
                      wrote on last edited by
                      #12
                      This post is deleted!
                      1 Reply Last reply
                      0
                      • espresso8031 espresso8031

                        If anybody runs into some script errors in private mp matches like I did, using different manifests solved it for me

                        download_depot 42680 42682 2661317971072643596 
                        download_depot 42680 42683 1595601894688570808 
                        download_depot 42680 42681 5651167211650965131 
                        download_depot 42690 42691 4104640605720756125 
                        

                        please remember to clear your plutonium iw5 cache.

                        All credit goes to discord users Fry and Raine! Hope this helps someone.

                        5persondude
                        5persondude
                        5persondude
                        wrote on last edited by
                        #13

                        espresso8031 Here are the DLCs for people that own them:

                        DLC1: download_depot 42690 42695 9005316271397236436
                        DLC2: download_depot 42690 42696 2478272765185873756
                        DLC3: download_depot 42690 42697 5810618727794750362
                        DLC4: download_depot 42690 42698 5997898371746217629
                        
                        1 Reply Last reply
                        0
                        • DirkRockface DirkRockface referenced this topic on
                        • DigitalRifle
                          DigitalRifle
                          DigitalRifle
                          wrote on last edited by DigitalRifle
                          #14
                          This post is deleted!
                          1 Reply Last reply
                          0
                          • DigitalRifle
                            DigitalRifle
                            DigitalRifle
                            wrote on last edited by
                            #15
                            This post is deleted!
                            1 Reply Last reply
                            0
                            • KanonAlfa
                              KanonAlfa
                              KanonAlfa
                              wrote on last edited by
                              #16

                              Yes it works, I can already play multiplayer on Plutonium, but the base game on Steam no longer opens; the campaign and the other game modes don't work anymore. Is there a solution for that, or are they going to make Plutonium compatible with the new update so everything works fine?

                              SyncHole 1 Reply Last reply
                              0
                              • Rayndown
                                Rayndown
                                Rayndown
                                wrote on last edited by
                                #17

                                Mods should pin this

                                1 Reply Last reply
                                0
                                • 26lake
                                  26lake
                                  26lake
                                  wrote on last edited by
                                  #18

                                  appreciate it a lot man

                                  1 Reply Last reply
                                  0
                                  • 26lake 26lake referenced this topic on
                                  • KanonAlfa KanonAlfa

                                    Yes it works, I can already play multiplayer on Plutonium, but the base game on Steam no longer opens; the campaign and the other game modes don't work anymore. Is there a solution for that, or are they going to make Plutonium compatible with the new update so everything works fine?

                                    SyncHole
                                    SyncHole
                                    SyncHole
                                    Contributor
                                    wrote on last edited by
                                    #19

                                    KanonAlfa the one on steam probably doesn't like being launched in the downgraded state, if you play the game on steam i would recommend just making a copy of that folder elsewhere for plutonium, and change the app manifest back to not being read only

                                    1 Reply Last reply
                                    0
                                    • xSNAFUx
                                      xSNAFUx
                                      xSNAFUx
                                      wrote on last edited by
                                      #20

                                      I only own MW3 Dedicated Server, not the game. So I can't download DLCs which fix Private Match script error. There's no way to play for me rn?

                                      SyncHole 1 Reply Last reply
                                      0
                                      • xSNAFUx xSNAFUx

                                        I only own MW3 Dedicated Server, not the game. So I can't download DLCs which fix Private Match script error. There's no way to play for me rn?

                                        SyncHole
                                        SyncHole
                                        SyncHole
                                        Contributor
                                        wrote on last edited by
                                        #21

                                        xSNAFUx The new update added a couple scripts itself i believe, the best way to do this is to clean up the mw3 directory itself before downgrade, just delete all the mw3 files and retry, i believe that error should go away

                                        joaoguerardi 1 Reply Last reply
                                        0
                                        • SyncHole SyncHole

                                          xSNAFUx The new update added a couple scripts itself i believe, the best way to do this is to clean up the mw3 directory itself before downgrade, just delete all the mw3 files and retry, i believe that error should go away

                                          joaoguerardi
                                          joaoguerardi
                                          joaoguerardi
                                          wrote on last edited by
                                          #22

                                          SyncHole could you clarify what you mean by cleaning up the mw3 directory? if i delete its contents and just download it from steam again won't it just download the same bad scripts?

                                          1 Reply Last reply
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                                          • joaoguerardi joaoguerardi referenced this topic on

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