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I have the following Joomla version:

I opened Components -> Joomla Update page, pressed Options button at the upper-right corner and selected “Joomla Next”:

and the following has appeared:

installed the update:

Pressed “Check for Updates” button again and got this:

Joomla 4 requirements:

I moved the website to new hosting and it started to work:

and I successfully updated it to Joomla 4:

Joomla 4 System Information: