I had the same problem. Contacted Radioddity support and they were very helpfull. Here's what they sent me and it works:
Hey Eugene,
This is Leslie from Radioddity customer service. Please try the step below:
Extract the files in the archive.
Download the support files from this link:
https://drive.google.com/file/d/1W4s-ieUPxom_RTwAkc1ljxCrzjZLSHJ7/view?usp=sharing
Extract the files from the support files archive
Copy the DB25_GMRS_CPS.exe file from the original archive into the folder where the support files are extracted to
Open the DB25_GMRS_CPS.exe app.
If it still does not find the files, Right-Click on the DB25_GMRS_CPS.exe file and choose Run as administrator.
Cheers,
Leslie
Radioddity Support Team