First off all im pretty new to Reverse Engineering. Im Stuck on Saving my Project. When i want to save the Assembly as .exe file Reflexil says cant save, the specified Method is not supported. I tried it even with the untouched original File, and it gets me the same Error. Pls help im kinda stuck.
Yep! Been there. It was VERY VERY picky about the order that you did things in, but then I found dnSpy. (FOSS), grab it, use it, and never look back.
There is also dotPeek Decompiler - works great https://www.jetbrains.com/decompiler/