can i upgrade to mac catalina on a 2009 macbook pro
how can i upgrade my mid 2009 Mac Pro to catalina 10.14.6?
You need at least a 2012 MacBook Pro to upgrade to Catalina: https://support.apple.com/kb/SP803?locale=en_US
Also, macOS 10.14.6 is the Mojave version, but that requires a 2012 MBP also: https://support.apple.com/en-us/HT210190
