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MW3 Downgrade and Update Prevention Guide

Scheduled Pinned Locked Moved MW3 Client Support
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  • 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 Offline
    Vipadus Offline
    Vipadus
    wrote 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.

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    • Grubs.gg Grubs.gg referenced this topic
    • Benson774 Offline
      Benson774 Offline
      Benson774
      wrote last edited by
      #9

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

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      • Benson774 Offline
        Benson774 Offline
        Benson774
        wrote 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

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        • 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 Offline
          SkUlLcRaCkErgd Offline
          SkUlLcRaCkErgd
          wrote last edited by
          #11

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

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          • 5persondude Offline
            5persondude Offline
            5persondude
            wrote last edited by
            #12
            This post is deleted!
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            • 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 Offline
              5persondude Offline
              5persondude
              wrote 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
              
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              • DirkRockface DirkRockface referenced this topic
              • DigitalRifle Offline
                DigitalRifle Offline
                DigitalRifle
                wrote last edited by DigitalRifle
                #14
                This post is deleted!
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                • DigitalRifle Offline
                  DigitalRifle Offline
                  DigitalRifle
                  wrote last edited by
                  #15
                  This post is deleted!
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                  • KanonAlfa Offline
                    KanonAlfa Offline
                    KanonAlfa
                    wrote 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
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                    • Rayndown Offline
                      Rayndown Offline
                      Rayndown
                      wrote last edited by
                      #17

                      Mods should pin this

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                      • 26lake Offline
                        26lake Offline
                        26lake
                        wrote last edited by
                        #18

                        appreciate it a lot man

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                        • 26lake 26lake referenced this topic
                        • 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 Offline
                          SyncHole Offline
                          SyncHole
                          Contributor
                          wrote 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

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                          • xSNAFUx Offline
                            xSNAFUx Offline
                            xSNAFUx
                            wrote 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?

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