upgrading 10.12.6 to 10.13.6 without clean install
App store does not have any legacy method for downloading system updates.
I need to upgrade a late 2009 iMac running 10.12.6 to 10.13.6 without wiping disk for a clean install. Is this possible?
If so, where to find the software (since Apple doesn't care to provide any)?
Thanks for vectors!
iMac, macOS 10.12