Hi greetings,
I see you need to decompile your old software.
I have experiences decompiling software into vb.net / c# that able to used and modify.
Can you send the software you need to decompile? I'll try it and give you update it it's possible or not.
If it's possible, I will continue decompiling after you award me this project.
Please send me the program, thank you
UPDATE : Just to let you know, that I understand your goal and purpose for decompiling your software, you want it to be able to register the software, so you can access all features.