update older mac book

puertoman wrote:

MacBook Pro (Retina, 13-inch, Late 2013) can not update to10.15.6 ?

MacBook Pro 13″, macOS 10.15

You don't say what you are currently running—

I can only assume by what little you posted you are looking for the point update...

Try the direct download for the combo

Combo update macOS 10.15.6 https://support.apple.com/kb/DL2048?locale=en_US

if you are still having an issue Try from a SafeBoot https://support.apple.com/en-us/HT201262

Your MBP is eligible for the Catalina update 10.15.6. As per article https://support.apple.com/en-us/HT201300

If you are unable to update. Backup your data and try clean installation from Internet recovery.

Your Mac will support Catalina.