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MW3 Downgrade and Update Prevention Guide

Scheduled Pinned Locked Moved MW3 Client Support
16 Posts 12 Posters 1.7k Views 3 Watching
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  • blitzou Offline
    blitzou Offline
    blitzou
    wrote 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
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    • candy2 Offline
      candy2 Offline
      candy2
      wrote last edited by
      #7
      This post is deleted!
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      • blitzou blitzou referenced this topic
      • 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?

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