I don't know how to fix this, it is a friend's 2017 Macbook Air running High Sierra, thought I would update it to Big Sur finally.
There is an issue with my mac running High Sierra. Now that I need to update, it is showing this.
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Server-side problem, affects all Macs running 10.11–10.13. Not your fault but there’s nothing you can do. Functionality still works, it’s all just a bit ugly. – Wowfunhappy May 25 '21 at 12:51
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If you want to update the OS itself, then you don't actually need that page; you'll find Big Sur on the main Featured page. The other pages seem to work OK. – Tetsujin May 25 '21 at 13:03