suggest to export PDF of your returns with all forms and worksheets rather than depending on opening the old s/w to open it, and refer to that for your 2024 return. I've rarely had to go back to an old TT s/w version but frequently refer to the PDFs.
the s/w is supported by TT for current version and 3 prior versions. Older versions should keep running beyond that, but not guaranteed and you certainly won't be able to reinstall and reactivate it on a new computer. So the PDF should be your official record anyway. 2021 is about to fall off this support when they release 2025.
hope that helps.
