Catalina 10.15.6 will not install on my MacBook Pro (Retina, 15 inch Mid 2014). Tried several times. No error report.
How do I trouble shoot Catalina 10.15.6 not installing?
MacBook Pro Retina
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What OS is your mac currently running.
What happens when you try to install Catalina, more information would be nice.
Apples official line is that you can upgrade directly to Catalina from
MacOS X Mavericks and later OS's.
A few people who have tried to install Catalina from an earlier OS X
have noted the installation process stalls.
This is probably due to the installation having to convert the old HFS+
file system to the newer APFS file system.
One way to get round this is to make an intermediary upgrade to macOS High Sierra.
Please use Safari to access the following links do not use Firefox
How to upgrade to macOS High Sierra - Apple Support
Before upgrading make a full back up of your Mac.
Check that third party apps you use have updates available for the new OS.
Check that your printers/ scanners etc have updated drivers and software available for the new OS.
Connect your mac to your router via cable rather than rely on WiFi.
Do not use your mac while it is downloading
and do not use any other devices that share the same internet connection.
If the App Store says ‘Open’ then it is detecting a previous download of the install app
go to the Applications folder locate Install macOS ******.app.
Move it to the Trash, empty the Trash.
Restart, click on the link again, the App Store should say ‘Get' or 'Download'.
If you are considering upgrading to Catalina be warned that it does not support 32bit apps.
Your Mac is probably running 32bit apps and these will need to be updated to 64bit apps,
some updates may be free, some may be paid. Use this app to discover which apps you have
are 32bit, https://www.stclairsoft.com/Go64/. Once the list has been created you can then
contact the developers of the apps to see if they provide 64bit updates.