Downgrade MacOS

Firstly and as suggested by @babowa - make a Time Machine Backup before attempting anything.

This will require a  Bootable Installer of Big Sur . All instructions are from within the provided link.

Now, Terminal command without Quotation Marks

"  softwareupdate --list-full-installers " this will list all Full Versions of macOS this computer qualifies to run.

My output have just run to Test and is as per below >>

Title: macOS Big Sur, Version: 11.6.1, Size: 12428472512K, Build: 20G224

* Title: macOS Big Sur, Version: 11.5.2, Size: 12440916552K, Build: 20G95

Depending on you output decide is Big Sur 11.6.1 or Big Sur 11.5.2 it acceptable to your needs.

Again Terminal command an without Quotation marks

" softwareupdate --fetch-full-installer --full-installer-version XX.X.X " where XX.X.X is substituted with the version number desired.

It will Pull the Full Version and place a new Application in Applications Folder called " Install Big Sur. It does not Launch and one should not attempt to Launch as it will fail.

As per earlier instruction - make the Bootable Installer

The last step and understand will happen as there is go going back.

This will WIPE ALL DATA and there is no Recovery from this - Period.

Once that is done read on for preparing the Destination computer 

>> Only works on Intel Based Apple Computers.

Extra Special Notation regarding the Touch ID equipped Apple Computer.

About Startup Security Utility and Must Enable from Recovery Mode the ability to boot from External Drive Before Attempting 

1 - Shutdown computer and disconnect all external drive Except the newly created Bootable Installer.

2- Restart and immediately hold the OPTION key until the Startup Manager appears and choose the USB Drive. 

3 - It will present options >> Disk Utilities >> View >> View ALL attached Drives. 

4 - Choose the Upper Most Drive ( not the volumes indented and list below ).

5 - The drive normally is called Apple Media or Apple SSD - that is the drive to Erase and format as APFS with the GUID Partition Map. This applies to macOS 10.14 Mojave and above. 

6 - Once that is done >> backup out of Disk Utilities and choose install macOS. 

7 - Follow the prompts and it may automatically reboot several time. 

8 - Upon a final reboot - Setup Assist will present with the newer version of macOS.

If you have a full backup of that earlier version - yes.

If not, almost impossible since Apple does not readily offer older OS versions - but may be possible if youc an find or create an installer.

megohms wrote:

Since I updated my Mac to Big Sur 11.6.2 Adobe Lightroom no longer recognizes all the EPSON printer paper ICC profiles anymore. Can I downgrade to an earlier version to resolve this issue?

Earlier version of what ?

Earlier version Big Sur ?

A entire version of macOS ?

11.6.2 fixed several issues of the earlier version so may want to reconsider downgrading to an earlier version and try to resolve your printer issues..