you need to unistall any previous version (if you dont want it anymore), and download all the files of the version you want, in your case FL2026 files are this:
Football Life 2026 download:
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Not official Option file (EDIT00000000) for Transfers update to season 2026-2027 on football life 2026:
download...
(kits 2026-2027 not included)
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Note: there already is "Football Life 2027" with many good news:
https://evoweb.uk/threads/sp-football-life-2027-discussion-thread-pc.106347/ , (released 31 Oct 2026 and updated to v.1.1 at the moment i write), but it's still a work in progress with many Database ID issues and other bugs, ... maybe you want to try it (very good gameplay and new animations imported from efootball) but for a more stable game confid more on FL2026 in this moment... For FL2027 we all hope SmokeTeam release a very important new update that will corrects many issues... but maybe we have to wait many others for a mature good version of the game, and fixes could be necessary also by this community