I’ll quote @slbaumgartner
You can use Finder->Go->Go To Folder and copy-paste the following in the dialog prompt:
~/Library/Application Support/SketchUp 2022/SketchUp/Plugins
to see the 22 extension folder
~/Library/Application Support/SketchUp 2023/SketchUp/Plugins
to see the 23 extension folder.
(I found this topic in seconds, by typing “extension folder mac” into the search bar)
you have 3 choices
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you can simply copy from 22 to 23, but it’s at your own risk, some extensions will make SU23 crash. that’s why the transfer is not automated. there are thousand of extensions, some not developed anymore, SU can’t keep track of it all. Doing the copy method might require uninstalling / reinstalling some stuff by hand still. I know I had to, couple extensions made my SU23 top bar crash when I copied them. reinstalling fixed them.
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you can reinstall manually from the extension warehouse what you need. if you don’t use many of them, it’s a valid solution, allows you to do some cleanup.
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if you use sketchucation, you can install your SU22 bundle into your SU23 with one click.