if you're getting "game installation not found" - you have downloaded bad release or bad repack (3DM, ALI, Corepack) - right?OK, this can be fixed.Open Notepade and put this text in it:Windows Registry Editor Version 5.00[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\GOG.com\Games\1207664643]"PATH"="C:\\Games\\The Witcher 3 - Wild Hunt""GAMENAME"="The Witcher 3: Wild Hunt""STARTMENULINK"="C:\\ProgramData\\Microsoft\\Windows\\Start Menu\\Programs\\GOG.com\\The Witcher 3 - Wild Hunt\\The Witcher 3 - Wild Hunt""STARTMENUFOLDER"="C:\\ProgramData\\Microsoft\\Windows\\Start Menu\\Programs\\GOG.com\\The Witcher 3 - Wild Hunt""GOGGAMEDLL"="goggame-1207664643.dll""GUID"="{BF679CAD-FE6D-4CBE-9E99-D7193809207A}""BUILD"="28""STARTMENU"="The Witcher 3 Wild Hunt""gameID"="1207664643""uninstallCommand"="C:\\Games\\The Witcher 3 - Wild Hunt\\unins000.exe""DEPENDSON"="""DLC"="""INSTALLDATE"="2015-05-12 00:00:00""VER"="2.0.0.28""SUPPORTLINK"="the_witcher_3_wild_hunt""LANGUAGE"="english""GALAXYLINKS"="1""SAVEGAMEFOLDER"="C:\\Games\\The Witcher 3 - Wild Hunt\\""LAUNCHPARAM"="""LAUNCHCOMMAND"="C:\\Games\\The Witcher 3 - Wild Hunt\\bin\\x64\\witcher3.exe ""EXE"="C:\\Games\\The Witcher 3 - Wild Hunt\\bin\\x64\\witcher3.exe""EXEFILE"="witcher3.exe""WORKINGDIR"="C:\\Games\\The Witcher 3 - Wild Hunt\\bin\\x64\\""SKU"="DIGITAL""languageText"="english""languageVoiceover"="english"By default the reg-file points to "C:\Games\The Witcher 3 - Wild Hunt" folder.If you installed the game to another one, edit reg-file, putting your path in there.In example, if you installed the game toC:\Program Files\The Witcher IIIreplace all pathes in reg-file withC:\\Program Files\\The Witcher IIIwith double \, as shown aboveThen you can import the reg-file to the registry & the game will be accessible by future GOG patches.Save the file as witcher3.reg and click on it.Before clicking on .reg file & importing it to the registry, make sure the pathes in it correspond to where your copy of The Witcher 3 is located.