Quote Originally Posted by JSoftware View Post
Replace all mentions you can find of 2.4.2 with 2.5.1, and you should be good again

Units compiled with a different version of the compiler cannot be used by the same compiler. It might be a very different PPU structure. Hence, you will also have to recompile lazarus when you've inserted the new FPC version info
When you say replace 2.4.2 with 2.5.1 do you mean in the fpc.cfg and Lazarus options?

I did notice that there is no ...)fpc\2.5.1\source\ folder, only a ...fpc\2.4.2\source\ what do I do about that?
Copy those files across so they can be re-compiled for 2.5.1?

There is also no make.exe for 2.5.1, only 2.4.2

cheers,
Paul