I cracked this myself with lots of difficulty.
How to Crack:
You need to find the entrypoint in the koi.exe
To find the entrypoint, search for [STAThread] in the koi.exe with the DnSpy and copy the token.
Go to .NET Directory, EntryPointToken in CFF Explorer and change the token with the one you have copied.
Entrypoint Fixed: https://mir.cr/R2GLH8AQ
Download link to software: https://mir.cr/0KZBHNCT
My patched file:
You need to open software once and skip sign up intro page and replace the file with the existing one.
Tested a bit, no problems met.