OS High Sierra
Hi,
I'm using a MacBook Pro (late 2011) with OS 10.12.6 Sierra, but I need to upgrade to 10.13.6 High Sierra. When I follow the apple links to the App Store page for High Sierra and click the Open tab I get the following message This copy of the Install macOS High Sierra application is damaged, and can‘t be used to install macOS.
Any ideas what I can do? I can't use a more recent OS as my Mac won't support it, but I need to get 10.13. I can't seem to find another download for High Sierra.
Any help (beyond saying get a new Mac) will be appreciated.
Thanks
Steve