I have catalina 10.15:7 and cannot download monterey, why?

macOS Monterey is compatible with these computers and check if this computer Qualifies for Monterey.

If it does Qualify, what happens when attempting to download Monterey ? Some details and context please.

Any Error messages and if so, what are the Error Message saying ?

Tips Monterey Upgrade 

If your MBP qualifies for Monterey try the following. I've had better luck from the Safe Mode because I evidently have some 3rd party software that interferes with the installation so try the following:

#1 - boot into Safe Mode according to Start up your Mac in safe mode - Apple Support.

NOTE: Safe Mode boot can take up to 3-5 minutes as it's doing the following; 

• Verifies your startup disk and attempts to repair directory issues, if needed

• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)

• Prevents Startup Items and Login Items from opening automatically

• Disables user-installed fonts 

• Deletes font caches, kernel cache, and other system cache files

#2 - go to the System/Software Update preference pane and begin the download.

#3 - run the installer from the Safe Mode.