Decompile Xsql Server Comparison

[ian]

Hello mate,
I started to crack the SQL Server Comparison Bundle v9 program (.net).
I decompile xSQL.Licensing.v4.dll file by using justDecompile tools, then extract the code and open with Visual Studio .
Final rebuild the dll and extract new dll.
After run the program there is an error in eventViewer:

Application: xSQL.DataCompare.SqlServer.UI.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.MissingMethodException
at k0.c()

Faulting application name: xSQL.DataCompare.SqlServer.UI.exe, version: 9.5.2.0, time stamp: 0x5c143804
Faulting module name: KERNELBASE.dll, version: 10.0.17763.475, time stamp: 0x69a188f0
Exception code: 0xe0434352
Fault offset: 0x0000000000039129
Faulting process id: 0x2560
Faulting application start time: 0x01d535822d244178
Faulting application path: C:\Program Files (x86)\xSQL Software\Test\xSQL.DataCompare.SqlServer.UI.exe
Faulting module path: C:\Windows\System32\KERNELBASE.dll
Report Id: 322ccb70-d387-4ba9-8dc8-d92061f5ed1b
Faulting package full name:
Faulting package-relative application ID:

Does the error result due to unsigned dll or what?
Can help me to solve this error.
Thanks in advance
ian