To fix the client.dll error, go to the valve folder, copy the cl_dlls folder and paste it into the mod's files. After that, if you didn't already, put the folder of the mod (not rar or anything else) to your Half-Life folder. After that, make a shortcut of halflife.exe, go to its properties and add "-game foldernameofthemodhere", change the "foldernameofthemodhere" to the name of the folder of the mod you extracted from the rar file. Hope this helped, and goodbye for now!
How to fix the client.dll error for Half-Life Mods
I hope this will help you fellow players that have some issues play Half-Life mods.
Posted by ayalp0133 on - Basic Other
When I try to start the game after select Decay in "Custom Game" I get "Invalid DLL version" error.
The only thing I didn't was "go to its properties and add "-game foldernameofthemodhere"" ("add" where exactly? I'm using Windows 7)
(please read the last but of words before end or all if u want) sorry for the late reply, after you create the shortcut file you need to go to the shortcut's properties, add quotes to the location of the original file (something like C:\Program Files (x86)\Steam etc. until decay's .exe file) and then write -game foldernameofthemodhere after the location. btw the "foldernameofthemodhere" needs to be the actual name of your mod's folder this just works for me in the cracked hl1
let me know if it worked for you too
another thing: this may break a thing or two about some mods but generally they arent much like when i tried it in hl:echoes it broke the shotgun and cutscenes just go black but it isnt anything experience breaking. BUT ALSO it may be breaking because you changed the original dll too which is probably my problem while writing this but im not sure tho. maybe it could be because the expansions for half life have different main files but anyways oops