From personal experience - I have TurboTax programs on my Win 10 laptop that was upgraded from a Win 7. The TurboTax programs for tax years 2010 thru 2015 all work using Win 10.
If it was me, I would keep all the prior tax year CD's just in case there was ever a need to open the tax returns for those years. Also, if you ever have to amend a tax return, you must use the TurboTax program for the tax year to amend the return. I assume that you have backed-up all of the tax data files and PDF's you saved of all the prior year returns.
