Unity - Bug in Unity Hub : Unity is already in list. You cannot locate the same version - unity3d

When I launch a project via Unity Hub, the following message is printed : Unity is already in list. You cannot locate the same version.
unity hub error
And when I want to access my project via Assets -> Scenes.
I get this : error message
If I said "continue", my project is broken with a lot of errors to fix.
Have you a solution ?
Thanks

From what I see in your screenshot, you are trying to open a project with an older unity version than the project's version. As it is written in the message, the operation is not supported and you should open it with at least the same version, or an older one. Make sure you have such a version installed in Unity Hub and to open the scene with this version.
You can still try to get everything to work by reimporting all you assets in Assets -> Reimport All but this will probably fail.

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This looks like a known, and for now, unresolved issue that can occur when using the Unity Hub.
https://forum.unity.com/threads/unity-doesnt-open-from-unity-hub.524320/
There's a bunch of suggested fixes from users:
using a wifi connection only (unplug ethernet cable)
reissuing the license
reinstalling the hub
using Unity without the hub - just as a standalone
And Unity is promising an update somewhere in the undefined future.
If you have a working older version you are upgrading from I would stick with that for now. But you can try any of the suggested fixes and work arounds.

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You should try this post:
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It says no reinstall required. But I would try that next.
It cannot hurt to read this as well:
https://docs.unity3d.com/Manual/android-sdksetup.html

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Adding a script through the inspector creates a file, but yields these errors:
Although the file is created, it does not appear in either the project browser, or inspector panels.
Googling various parts of these errors actually gets a lot of posts, but almost all of them come down to "restart Unity", which isn't doing anything.
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When they open my changes they get the following message "oh no the project was saved with 5.5.0f3 and you're using a newer version"
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