Do not click the "Unity Hub" button. Instead:
If you need to install Unity on a machine where you don't have the Unity Hub or standard installer access, you can use a manual download or command-line approach. unity portable install
: To move a project, copy the entire root folder (containing the Assets , Packages , and ProjectSettings folders) to your external drive. Do not click the "Unity Hub" button
Keep a readme.txt on the drive root with the command to run ( mklink /J "%LocalAppData%\UnityHub" "D:\UnityPortable\Hub\AppData" ) so you don't forget it. unity portable install