Hello! If you just want to play the original version of Resident Evil 5 for PC for Games for Windows Live (GFWL) for some reason and still do not know how to downgrade your Steam version, visit this official guide below by teaching step by step and back here after completing the whole process.

https://steamproxy.net/app/21690/discussions/0/618458030682937808/

Well, after finishing this process, you should notice a problem that when playing the game and trying to log in with your GFWL account, you obviously need the game key to activate it in your account, but Steam does not give the game key to the GFWL version because that platform is discontinued. And in search of buying the key for the GFWL version I have not found it anywhere on the internet for sale. But after much research I found a way to acquire.

There is a game called "Kane & Lynch Dead Men" that is located for sale in the Steam store:
https://steamproxy.net/steamstore/app/8080/Kane_and_Lynch_Dead_Men/

This game also uses GFWL but its key is different from other games, because its key is in an old GFWL format that you could activate any other game having that key.

I recommend that anyone who is reading this guide has RE5 in steam game library.

So what you're going to do is buy the game "Kane & Lynch Dead Men" on Steam (I highly recommend buying in season of discount sales, I'm currently doing this guide at the beginning of the year and it's still happening the Winter Sale so it's a good time I recommend it a lot because I do not know if this process will work forever and I do not want you to spend money in vain).

OK! When buying the game you will have to download it and run it. When you run it on Steam inform the game key for you to activate it in GFWL. Then you copy the key, open your RE5 downgraded to the GFWL version and activate!

I ask a lot to those who do this process, post below their results telling you if you were able to activate the game or not. So that in the future other people can see and know if this method is still working.