German national team fix savegame compatible?

Is there a a way to unlock the german national team after you have started a game? Also if there is one do you know how to do it on mac?

In theory if you remove the files within the "all" folder as explained here (that tutorial includes instructions for Mac), it might work even after you have started a game but you'd have to wait until the next international call up.

Personally I haven't tested that scenario and the most recent successful report on this was back in FM 2014 when someone said that was actually working.

It works. I hadn't removed the all folders and after I did it in the middle of the season, the German team was fixed. The change occurs on the next international call-up, so you may need to wait a little.