As part of the transition to 64-bit technology in macOS, you might see an alert when opening iWork '09 versions of Pages, Numbers, and Keynote that the apps won't be compatible with future versions of macOS, beginning with macOS Catalina 10.15.
Update to the latest versions of Pages, Numbers, and Keynote to continue using your iWork documents in macOS Catalina. The newer versions of iWork for Mac can open any document created in older versions of iWork. When you open older iWork files in newer versions of Pages, Numbers, and Keynote, you're notified if there are any changes to your document.
Update your apps
Remove older apps
If you've upgraded to macOS Catalina 10.15 or later and downloaded the latest versions of Pages, Numbers, and Keynote, you can remove the older versions:
- Click Finder, then choose Go > Applications.
- Select the iWork ’09 folder, then choose File > Move to Trash.
- Enter your password if asked, then click OK.