@Solar Eclipse so it seems you can install old versions but won't be able to activate versions older than 3 years.
I have an old Mac with TT from 2015-2022 on it, I tried launching 2019 - it updated itself and runs fine (I was able to bring up an old tax return). When I do a fresh install of TT 2019 on a new Mac it won't activate ("error code 630").
I did a fresh install and activation of 2022 on the new Mac along with 2023 & 2024, worked fine as I would expect, including software updates and state tax installation.
All the downloads and license keys are available from your Intuit account under Products and Billing, tho I did find for 2022 when I had purchased from Amazon it was not available to me on Intuit I had download it from Amazon again, but they keep your download history.
So yes consider it a 3 year license minimum, longer if the computer where it was activated lasts.
