Retriving a document from iCloud
So I thought I'd like to be able to work on a Numbers spreadsheet on my iPad in addition to my iMac (Mojave). So I set up iCloud to use the document. All good. Except now the document cannot be opened on iMac at all, either over iCloud or locally after I turned off iCloud. I get an error that says I need an update of Numbers. OK... except to get that, I have to upgrade my OS on my iMac. I am NOT going to update my OS just for that. So now, I cannot access the document AT ALL. I've been using this document to keep track og things for YEARS, and now, I cannot use it on my iMac unless I update my OS. Nothing in the Apple help says anything about needing OS11.
iMac 27″, macOS 10.14