as of now yes you'll be forced to upgrade to w11 unless you use online. No one knows if Turbotax will change its mind but considering 1) how late in the year it is and there is much coding that needs to be done due to tax law changes and 2) Turbotax would have thoroughly analyzed what it would lose in net income from desktop customers who wouldn't upgrade or use online (switch to a competitor's product compatible with w10 or so) vs what it would make up from those that would switch to the higher priced online, and concluded bye-bye to those that wouldn't switch. or upgrade.
there are ways to keep w10 and upgrade a non-compliant computer.
1) dual boot (both OS present on separate drives or partitions but only one OS can be used at a time or
2) crate a virtual machine both OSs work at the same time because cores and memory a specially allocated to each OS
i did 1) tried 2) but it consistently failed even tried three different VM apps
I have no guarantee the TT2025 will install on the W11 drive
