Issue Description:
This issue occurs usually after uninstalling the current Tetherfi Outlook Plugin version from the control panel window and then user again tries to install the same version of the file.

Error window is shown while installing a plugin
Resolution:
Uninstalling Tetherfi Outlook Plugin from the windows control panel sometimes will not remove all files from the installation directory path.
This issue occurs only when the user tries to run the same version (i.e. previously uninstalled) files again.
To solve this problem, follow steps as below,
- Navigate to path C -> Users and select the logged-in user id/LANID folder.

As shown in the above screenshot, my username or login name is User. In your case, it might be different, might be a system login name or Lan-ID or any configured name.
Once you identify correct folder, then navigate further to below path,
C -> Users -> (UserLanID/UserProfileFolder) -> AppData -> Local -> Apps -> 2.0
Once you are able to navigate till above folder path, you will notice two folders (as shown below) inside 2.0 folder,

Both folders are created at the install time of the Tetherfi Outlook Plugin application. Folder W47RZ0NJ.575 is a random folder
generated by Plugin on installation, hence it might be with a different name in your location.
Delete both the folders and try installing the plugin again. This must resolve this issue.
2. If the issue still persists we suggest you check out our below post and follow our instructions provided there.
Error: Unable to install, TetherfiOutlookPlugin.dll.config has a different computed hash than specified in the manifest.