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You have to uninstall ShortPoint from all subsites, you do not need that. We recommend to add ShortPoint at the root of the site collection and enable site scope installation.
Please follow these instructions to successfully uninstall ShortPoint from all subsites:
Uninstall Step 1: ShortPoint Add-In Deactivation
Uninstall Step 2: Remove from Site Contents
Uninstall Step 3: Remove from Site Collection Recycle Bin
After you uninstall, go to the root site where you have the latest version installed, open ShortPoint Dashboard and click reinstallation and upgrade.
Make sure the dashboard is showing these messages:
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