Symptoms
Experiencing issues when attempting to reinstall the Chrome extension after it has been uninstalled.
Cause
When the Chrome extension is uninstalled via the Chrome user interface, it's no longer installed by the PDF-XChange installers or updated on each startup. In other words, the external extension is blocklisted.
Resolution
If you want to remove the blocklist tag, then simply install the extension as normal through the Chrome user interface, or the webstore here.
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