My 2011 Macbook pro runs on OS 10.12.6 Sierra.  I use Numbers on my pro to handle all my financial records.  Before going on vacation, I saved my current workbook to icloud so I could add to my expenses on my ipad.  On returning home to the pro, I couldn't get into numbers - says I need to upgrade.  My current system won't upgrade to the new numbers.  An option pops up to download a "workable" older version with my system, but nothing happens when I click that download.  Need help!  Thanks