Change software from OS X El Capitan to Catalina
I have software OS X El Capitan and need to change to macOS Catalina
MacBook
You can make a difference in the Apple Support Community!
When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.
When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.
I have software OS X El Capitan and need to change to macOS Catalina
MacBook
Here are some user tips from Photos for Mac User Tips that will help you in your transition from iPhoto to Photos:
How to prepare the Photo Libraries before upgrading to Catalina - Apple Community ➙ read first if you haven't already upgraded to Catalina
Notes on Migrating an iPhoto Library from iPhoto to Photos for Mac
External Editors in Photos Are Here
Photo Editing Extensions for Photos for Mac
Post 9/30/2018 Printing Options for Photos - Apple Community
Ordering Books and Calendars on a Mac that cannot be updated past El Capitan
Use Project Extensions to order print products in Photos after September 30, 2018 - Apple Support
Create and order print products in Photos with Project Extensions - Apple Support
Do keep in mind that 32 bit apps no longer work in Catalina. So if you are running older software, chances are some of them may not work.
Change software from OS X El Capitan to Catalina