Hi Flood, thank you for the quick answer. There are different OSs- win 7 and win 10, build 1909. Same problem on both OS. Kaspersky anti-Virus 20.0.14.1085 YES. We have a couple of licenses. NO It is a custom application. We have an application server, SQL database. We just copy shortcuts from app server to the client computer. Please see attached picture We bought licenses from the official dealer, but it seems that licenses are home edition. Best regards! J