Cannot generate unsigned license file

Good day!

I bought a license “CoolStar SST Audio (AVS)” to activate audio drivers on Acer R751T (CPU Intel Celeron N3350). Driver archive was downloaded successfully and the root installer was run successfully.

But when I launched “GenLicense.exe” to create an unsigned bin file, an application was started and suggested to save the file, however if was not found after save. I tried different folders as save destination, but none of them worked.
During file generation, all AV programs were disabled, “show hidden files” option is enabled.

How can I fix this issue?