Define “latest version”. There are multiple options.
If you want to…
- update to the last 6000.2 version (6000.2.15f1), click here or visit the Archive.
(Not recommended due to a known bug.) - upgrade to the latest LTS version (6000.3.13f1), install it via Unity Hub or visit the Archive.
- upgrade to the overall most recent (a.k.a “Supported”) 6000.4 version (6000.4.2f1), install it via Unity Hub or visit the Archive.
No matter which one you choose, make sure that you create a backup of your project first. This can be done by making a copy of it or by .zip-ing it up, but preferably you should use Version Control.