Either that or their server is down at the moment and you may just have to wait.
Anything is possible.
Found the same thing last night so watched a show or 2 on an other channel ! I checked again around midnight and boom - installed nicely! FWI, I did not have to uninstall old version but I was thinking it ! Having no issues !
Must be so many wanting to update that the servers got busy.
That’s what I’m thinking !