Sequoia 15.0.1 for mac is not working with Indesign 19.5

InDesign CC (version 19.5) is the latest release, as I would assume you already know.

As it was just release in July of this year, it should work in Sequoia. But to move back to Sonoma, you have to do one of two things. This assumes you have the space available.

1. Create a current backup. Completely erase the Mac, install Sonoma and restore the backup at the end of the install routine.
2. Create a new volume on your Mac and install Sonoma there, followed by a restore of the same backup. You'll have both Sequoia and Sonoma on your Mac and can then start up to either.

The latter may be preferable. You can keep installing updates to InDesign under both OS's. When InDesign is finally updated to work properly under Sequoia, you can then remove the Sonoma volume.

No need to apologize. My response was to AlWeir.

Not that I haven't done the same thing on occasion. You did clearly state Sequoia, but your tagline says iPad Pro, iPadOS 17. If a person (including myself) doesn't read closely enough, you end up making nonsensical suggestions.

Did you touch base with the developers of Indesign and see if they have a update for the iPad

What would an iPad have to do with Sequoia, which is the latest Mac OS?

Read through the comments on this thread, but they are widely available on the net.

Unable to downgrade from Sequoia to Sonom… - Apple Community