I use the cheapest USB-serial adapter I could find on eBay and it works just fine with Windows 7, Windows 10 and Cisco equipment. It cost around $5, and I did not even have to install a driver.

My HP laptop cost $200 in WalMart two years ago. It came with Windows 7. Last year I upgraded it to Windows 10 without any problem.

Just saying....


Vaya con Dios amigos!
Butch