If this errors are displayed then you must download "Visual C++ Redistributable 2015" and install the application.
If this error is displayed then you must download ".NET Framework" and install the application.
You always have to run and play with Administrator rights. This is done by right-clicking the "Rodnia Patcher.exe" or "Rodnia.exe" and therefore "Run As Administrator". If you have Windows XP, install .NET Framework to avoid problems that will occur.
The only solution is the permission to open this file by the antivirus or to close it. If the file has been deleted, copy from "here" the file and paste it into the specific folder, then run the game with administrator rights.
If you have Windows 7, run the client with administrator privileges before opening the game. The keys will work immediately, without any problems.