Well, I am running Windows 10 with all the latest releases. And I have the TurboTax software installed from tax year 2009 thru 2020. The IRS only holds tax returns for the last seven years so it would be no problem to amend any of those tax years.
I also backed up all the installation files, all the tax data files plus have all the forms, schedules and worksheets for each tax year as a PDF on a USB drive.
