little help upgrading keynote
hy all, I Kindly ask for your help. I have a iMac, I had Sierra 10,12,6 installed (is a iMac I bought second hand). yesterday I've upgraded to Sierra high. now I'm trying to make th update suggested by App Store, in particular keynote. when I lunch the update I'm asked to put my Apple ID and password and after that I receive a message error saying that the update cannot be done because it has been bought by another id or it have been canceled or refunded. any Idea? the id is correct. thanks a lot in advance.
iMac 21.5", macOS 10.13