A: Some legitimate old installers use packed executables (UPX) that antivirus programs misidentify. Upload the file to VirusTotal. If only 1–2 generic detections appear, it is likely a false positive.
The phrase "polyboard 6.05 free download" can be approached in a couple of different ways. Are you looking for: polyboard 6.05 free download
Alternatively, if 6.05 is no longer available legitimately, does the latest version have a free tier or trial good for hobbyist use? A: Some legitimate old installers use packed executables