It sounds like there are files left over from the previous base version 8.5...
it also looks like you chose to replace teh individual plugins instead of replaceing the entire folder.
I assume you upgraded base IN the plugin folder...
The better method is to
Delete the existing C:\cdinst\REATOGO-240\plugin\DriverPacks.net
(you could just move \DriverPacks.net\BASE to c:\BASE)
Install from any folder that is NOT a plugin (IE C:\dp_base\DPs_BASE.exe)
i think you will find that there are some .inf files @ C:\cdinst\REATOGO-240\plugin\DriverPacks.net\*.inf
those should not exist with base 8.12.