The loss of 'bank feed feature' MAY have something to do with the state of Internet Explorer on your computer.  If you do not have IE, it probably will not connect to anything because the virtual IE agent available in MS Edge is not up to the task.  I think it was not until the 2021 or 2022 version of QBP that Intuit eliminated this hurdle to online functionality.  Your Win 11 system will NOT have IE installed; your Win 10 system may or may not have it.

That said, you should be able to import an Excel file (my 2015 version offers this under File\Utilities\Import\), which is easy enough once you receive a CSV file.  You MAY have to 'save down' to an older version of Excel depending upon what you are using.  My version will not receive CSV files directly; must convert to Excel.

You can create and maintain any number of companies you desire, BUT you may have only one of them open at a time.  That can be a little bit of pain, but not insurmountable.  If you install the program on two computers, then you can have company and personal books open simultaneously, but on two different machines.  If one is a laptop and you have the desk space, it would be quite handy.

I did the "LLC Other Entity" when I set up my company 25 years ago.  I don't 'get to do payroll.'  <big grin>

I track expenses, track time for invoices, payments/receipts, bank accounts, and I created several custom reports to help with my Schedule E for taxes.  And I do my own taxes, though I do not use the Intuit product.

As far as how 'we' go into the UK thread, beats me.  If you'd not said that, I'd not have noticed.  Alaska here!