I'm trying to upgrade my Macbook Pro late 2011 from Sierra to High Sierra via this link:
However, when it opens the itunes store shows this error:
To be safe I tried it with the Mojave update via this link here:
and it gave me the same error. I read on this forum (and tried their solutions) that this might mean that it's not available for me to download. Where can I download the High Sierra update?