One-click update fails. 5.4 to 6

Hi, I’m trying to one-click update from EE 5.4.0 to 6 and I get the following message:

Oops, looks like the updater couldn’t complete.

We stopped on Downloading update….

Could not download update. The server returned an unexpected content type:

Try again in a few minutes or contact support if the problem persists.

I’ve found a similar post in the forums from last month and the issue was on EE’s side:

We had a header issue that’s now resolved.

PHP version 7.4.13

Any help here is greatly appreciated.

Thanks, Michael