Hello
I am an expert in .NET obfuscation and I believe I can help you decompile the library, I have also build my own decompile tools that I have built using C++ that can be helpful in this kind of work.
I will be glad to receive and give it a try then, I can let you know, if I can decompile
I will love to hear from you, send me the file I will give it a go
Regards
Lucy