Please explain "clients"? What do you need from them? All you need to Transfer from 2024 into 2025 is the data file ending in .tax2024. You need to copy that file from the Window 10 computer. It should be in the Documents folder then in the subfolder TurboTax. Or search the whole computer for all files ending in .tax or .tax2024.
Turbo Tax on Windows 11 should work the same as on Windows 10. Did you get Turbo Tax Desktop program downloaded, installed and activated ok?
