Many security programs will automatically delete "gen" files as a false positive or due to "riskware" flags. Check your quarantine folder if the file disappears. To give you a more specific guide, could you share: Which software or game are you trying to use this with?
Most versions of this tool provide a dropdown or text field for or Product ID . DHC_genV1.3.6.exe
If a Windows SmartScreen warning appears, only click "Run anyway" if you have verified the file's safety. Many security programs will automatically delete "gen" files