“ This title is hosted on an incompatible third-party website”
That is explained in the FAQ page in the Wiki.
Google drive has limit on how many downloads are allowed, I remember it was simultaneous downloads but it might be number of downloads in the past 24 hours. Try again in a few hours, it should work eventually and Google Drive is usually very fast so it downloads as fast as your net connection can go.
Mediafire free download might have a limit of 2 GB, then it slows down but should still work. Purchasing a faster Mediafire account removes this limit.
I just try it myself, Mediafire download rate fluctuates much, it is between 1.5 to 5.5 MBytes per second. It it now over 3,5 GBytes downloaded, and still going fast, so maybe there is no limit.
But Internet Search finds a few cases where downloads fail after 2 GB due to bugs in router or other network gear firmware.