Problem fixed here : https://forum.unity.com/threads/something-went-wrong-installing-unity.1024288/#post-7144625

Problem fixed here : https://forum.unity.com/threads/something-went-wrong-installing-unity.1024288/#post-7102291

I have Unity on my Chromebook. I downloaded it using terminal. My Chromebook has a like about 13.1GB of storage. I'm trying to add an old version of Unity editor with Android build support and i get the message installation failed/there is not enough storage to download the selected items. So I'm having the same issue.

FIX :After the install fails from unity hub go to C:\Users\USERNAME\AppData\Local\Temp\ and run the installer from there directly .This is the only thing that worked for me .

problem fixed here : https://forum.unity.com/threads/unity-hub-editor-installation-failed-an-unexpected-error-occured-during-installation.528367/#post-6143220

Same painful issue here (with Unity Hub 2.4.0)

View bugs we have successfully reproduced, and vote for the bugs you want to see fixed most urgently.

1. Open Unity Hub and go to the Installs tab
2. Click ADD and select any Unity version available there
3. Click NEXT and then DONE
4. Disconnect from the internet while the Editor is still downloading
5. Download and install the same Unity Editor versions as in step 2 from the Unity download archive
6. In the Installs tab click ADD and locate the Editor installed in step 5

Expected results: the Editor is added to the list of Unity installations
Actual results: Installation failed message is displayed and attempting to remove the Editor results in "Could not Delete Files" error

Reproducible with: 2.4.0
Not reproducible with: 2.3.2

Notes:
-An already existing installation can be used in the 5th step to reproduce the issue
-Restarting Unity Hub doesn't fix the issue and the "failed" installations remain. To fix the issue, deleting the Hub cache seems to be required
-Editors.json file points to the correct Editor location after reproducing the bug
-After reproducing the issue a "no folder path defined for {Unity version}" message is logger to the "info-log.json" file

Workaround (the file name changes depending on the version that's stuck in the "failed" state):
Windows: delete the "C:\Users\USERNAME\AppData\Roaming\UnityHub\downloadProgress%3A2018.4.27f1.json" file
Mac: delete the "~/Library/Application Support/UnityHub/downloadProgress%3A2018.4.27f1.json" file
Linux: delete the "~/.config/UnityHub/downloadProgress%3A2018.4.27f1.json" file

Workaround (the file name changes depending on the version that's stuck in the "failed" state):
Windows: delete the "C:\Users\USERNAME\AppData\Roaming\UnityHub\downloadProgress%3A2018.4.27f1.json" file
Mac: delete the "~/Library/Application Support/UnityHub/downloadProgress%3A2018.4.27f1.json" file
Linux: delete the "~/.config/UnityHub/downloadProgress%3A2018.4.27f1.json" file

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