Python tools seems to be broken. It’s still showing 2.2.3 is currently installed and update 2.2.4 is availiable. But during installation “Update” button is gray that makes update not possible
We accidentally published a release with the wrong version number in Extensions and Updates. This triggers the notification, even though you've got 2.2.4 installed (see Help/About).
It was republished last week with the fix - before it went public - but it seems people are still getting the earlier version somehow (probably a CDN issue). If you install the 2.2.4 release from the releases page you'll get the version number fix and won't see the notification any more.
(Uninstalling and reinstalling through the VS installer does not work because of the caching done by the installer.)
Thank you for the very fast reaction. This kind of slip-ups can happen to anybody.
But, after the install of 2.2.4 from the release page I still have an error loading the plugin.

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This is an occasional upgrade issue that we haven't been able to track down. VS keeps a cache of loaded assemblies that doesn't always get invalidated when it should.
If you delete C:\Users\You\AppData\Local\Microsoft\VisualStudio\14.0\ComponentModelCache and restart you should be fine.
@zooba FYI RTVS added setup custom action to wipe that folder, as a workaround to that occasional bug.
https://github.com/Microsoft/RTVS/blob/master/src/SetupCustomActions/CustomAction.cs#L66
@zooba
I had same issue. I removed "ComponentModelCache " and it works now. Thanks!! !:)
Most helpful comment
This is an occasional upgrade issue that we haven't been able to track down. VS keeps a cache of loaded assemblies that doesn't always get invalidated when it should.
If you delete
C:\Users\You\AppData\Local\Microsoft\VisualStudio\14.0\ComponentModelCacheand restart you should be fine.