Is it a problem to amend a Return when Turbotax has been updated in the interim? If so, can I somehow reinstall the original (rather than re-key everything)?

Due to the new IRS health regulations, we've been trying to get the right information into Form 1095A, and now the IRS wants us to file a 1040X.  In the meantime, we've already created duplicate/changed copies of the original return and have always said "yes" to updating the program.  To file 1040X:  

1)  Will it be a problem if we've already updated TurboTax to the newest software revision?  

2)  If so, (short of retyping the original numbers) what is the best & easiest way to amend the return?  For example can we somehow re-install the "old" TT?

3) If not, do we amend the ORIGINAL or the changed returns?