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MW3 Downgrade and Update Prevention Guide

Scheduled Pinned Locked Moved MW3 Client Support
20 Posts 15 Posters 2.1k Views 3 Watching
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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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