MBP 13" Late 2013 upgrade to macOS Big Sur

There have been some issues with Big Sur and the 2013 and 2014 model MacBooks.

Try the following and see if it helps:

Unplug all external devices from your Mac, including any displays and

USB accessories, and remove any card inserted in the SDXC card slot and see if that helps. If not see below.

Reset SMC

Now try to see if you are able to get the upgrade. If the issue persists, reset NVRAM or PRAM. Try again after this and hopefully it will allow you to download MacOS Big Sur.

Hope this helps.

I would also give this a try:

There have been some issues with Big Sur and the 2013 and 2014 model MacBooks.

Try the following and see if it helps:

Unplug all external devices from your Mac, including any displays and

USB accessories, and remove any card inserted in the SDXC card slot and see if that helps. If not see below.

Reset SMC

Now try to see if you are able to get the upgrade. If the issue persists, reset NVRAM or PRAM. Try again after this and hopefully it will allow you to download MacOS Big Sur.

Hope this helps.

That's a good site but here is the apple support page about it as well.

Cleanmymac is on your menubar. That is a virus. You will need to remove it with Devontechnologies EasyFind in safe mode (holding the shift key).

All Macpaw, and Zeobit software must be removed. Malwarebytes and/or Avast can help.

There should be no cleaner software on your Mac.

Etrecheck can identify other software that may be malware.

To be honest, I cannot give you an answer; according to the published specs from Apple, your device should be able to be compatible.

Hopefully, someone will have an idea. In the meantime, I'll suggest that you contact Apple support (use the link in the upper right corner of this page).

Alternate route?

If possible, what happens if you were to try to download it from the App Store and try to install?

https://apps.apple.com/us/app/macos-big-sur/id1526878132?mt=12

I select the link you provided to the app store. Select "get". Popup says it is searching for the update and then another popup tells me the requested version of macOs is not available. I click ok and I am told on the previous popup that my MBP is up to date with macOS Catalina 10.15.7.

Could not agree more on the "actual source" being the best reference, but sadly, more times than not, the "actual source" is silent. In October, Apple released for Mojave, a Security Update along with a Safari update. Those updates proceeded to make Mojave totally unusable. This went on for days until it was the blogs and second hand sources that brought it to user's attention. The response from the "actual source" was total silence. After three days, Apple pulled the two Mojave updates from the servers. To this very day there has been no explanation or acknowledgment.

Hi! I have the exact same problem. Have you found out how to fix it yet?

Starting up in safe mode does not make any difference. Still cannot download Big Sur through sw update or App Store.

Here you go, If you can’t install macOS Big Sur on certain 13-inch MacBook Pro computers from 2013 and 2014

Originally I found out about this over at macrumors