1. Reproduce the error.
2. Run Diagnostics.exe
If possible, do this during the problem.
You can start it from the directory of the installed program
C:\Program Files\ZennoLab\EN\ZennoProxyChecker\3.6.0.0\Progs\Diagnostic.exe
In your case, the path may differ slightly (different drive letter, program version, language)
3. Send the resulting file report.zip to us
After the completion of the Diagnostics, the report.zip file will be generated, the file will be located in the directory where the program is installed (it will open automatically after the completion of the Diagnostics).
The resulting file must be sent to support.