Generally, if "view+refresh" doesn't work, it's due to a misconfiguration in the exam itself.
The browser checks to see if it's the appropriate version for that org and updates/downgrades as necessary. Manual uninstall/reinstall is NOT needed.
Please reach out to our Technical Support Hotline at phone number: 844-267-1017. CONTACT US
NOTE to Technical Support: If unable to resolve the issue, escalate to Tier 2 and Tier 2 will create a JIRA support ticket for the exam config to be double-checked.