Older versions of Probate Plus could display web content inside a browser window embedded in the Probate Plus main screen.
However, this embedded browser is now outdated compared to modern browsers and it can trigger script error warnings. Newer versions disable this feature completely but if you're on an older version of Probate Plus you may still have the option to use the embedded web browser.
Adjust your Probate Plus settings to switch off use of the embedded browser and retry checking for updates. This will instruct Probate Plus to use your default Windows web browser instead.