pimpjuice300 Said:
"Mac OS update: my sister had a mid 2012 macbook pro and it was being really slow so i checked it out and she was still on yosemite from 2014 so i expected a slow update from yosemite to catalina[...]it’s been about 30 minutes and the bar hasn’t moved and it says iabout a minute remaining' would like a resolve"
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Upgrading is the Culprit:
Upgrading directly from Yosemite(macOS 10.10) to Catalina(macOS 10.15) is not an option. You have to first upgrade to High Sierra(macOS 10.13), and then, once High Sierra is installed, upgrade to Catalina. So, to install each, use USB Bootable Installers.
Important - Always Backup Prior:
Have you recently created a backup of your Mac prior to all of this? if so, restore from the backup. If not, then take this as a learning experience, knowing to always backup your Mac, prior making any major change to your device, such as a macOS upgrade.