Hi g_a
The campaign fixes allow you move from the current one to the next.
Yours would be from Total Germany to Happy Times.
This should happen automatically but does not always do so because SH5 is broken.
vdr1981 and MaMa have produced different work around's so Campaign's can be advanced.
vdr's is the only one guaranteed to work every time and has easy to understand instructions that will answer your question.
If you are new to SH5 look > > HERE << STEAM is not compatible with the essential application TDW’s Generic File Patcher
Steam Conversion Installation Instructions for SH5 Updated Version
Highly Recommended SH5 > The Wolves Of Steel Mega Mod > Includes KSDCommander And Working Enigma M4 Machine
Peter