Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Did you try that link before posting it here?
When one selected language and click on "Download" link in "Proofing tools" it will point to proofing tools of MS office 2013 that is INCOMPATIBLE with 2010.
I spent already a few hours on this and it looks like either MS pushing to upgrade customers to MSO 2013 or it is regular glitch...