GTA V – Fixing Media Feature Pack Error in Setup Tool

My guess is that the installer is based off of some ancient technology developed in Blizzard's dark ages and, as you suspected, you cannot install on either a drive lettered A or B. As noted, this is because these were the floppy or other external media drives from a long time ago, and it simply won't recognize them as a valid install location.

You must change the drive letter to something NOT A-C (D is always a wonderful choice) in order to install Diablo III and commence the looting.

For me, it works this way:

You have 2 files for 1 savegame, for example: SGTA50000 SGTA50000.bak

You need both of them in the folder (C:\Users\USERNAME\Documents\Rockstar Games\GTA V\Profiles\SC_NUMBER). Try deleting all older savegames.

Restart the game and click on "Story Mode", the save will load automatically.

If this doesn't work:

1. Backup the "Rockstar Games" folder (C:\Users\USERNAME\Documents\Rockstar Games\)
2. Delete the whole Rockstar Games folder (C:\Users\USERNAME\Documents\Rockstar Games\) => This is safe, I also did that. But your game settings will be gone if you don't back it up.
3. Restart the game, the folder will be re-created new with all the needed data.
4. Put your newest savegame-files into the folder (both files): C:\Users\USERNAME\Documents\Rockstar Games\GTA V\Profiles\SC_NUMBER\
5. Restart and try again.