Both can be installed in parallel, GIMP 2.10 uses %ProgramFiles%\GIMP 2 by default, whereas GIMP 3.0 uses %ProgramFiles%\GIMP 3 by default.
Installers within a given stable release branch - e.g. 2.10.34, 2.10.36, 2.10.38 - are designed to remove the previously installed version of the same branch, mostly to prevent casual users from accidentally getting two such versions installed and leading to confusion. Though anyone who know how to copy and paste a directory can easily get around that as well and keep several 2.10 versions around, but that is usually people who are interested in testing e.g. whether a specific problem existed in a specific older version already.
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u/1wvy9x 19d ago
On Windows, do I need to uninstall 2.10.38 before upgrading to 3.0, or can both be installed in parallel ? Found conflicting information about that