Strictly speaking, my software ACP 6 might run on Windows 10 and 11, but I canít support it. ACP 6 is 11 years old, and pre-dates Windows 10 by 4 years, Windows 11 by 12 years. Since I donít have a crystal ball to see the future :-) I canít say whether it will be 100% functional or not. Also if you update FocusMax, will my 11 year old logic work with that? Also, our policy is not to offer upgrade pricing past 5 years out of date so if you want support and current software, youíll need to get a brand new license. I hope you can continue to get use from ACP. You might want to look at less expensive alternates if they can meet your needs. I apologize for seeming so harsh, I hope you understand.