I fear I'm in the same boat as nearly everyone here. Currently on 2021 Desktop version and only need to upgrade to 2024 Pro Desktop version.

I can offer that I have downloaded the Desktop Pro 2024 version from what I think is this very site:

QB Desktop Pro 2024

So now I have it and the web patch release found on the same link but I still have not found a way to actually purchase it or obtain new license and product numbers. I think the only way is to call intuit and discuss it with them which will probably lead to this 2024 Desktop Pro version being a subscription based product too.

Every "upgrade" option from within QB just takes you to the webpage for online versions. I have tried CAMPS and it says there are no products associated with my account even though I only have one intuit account and have upgraded every version of QB over the last 20 years. The whole thing has been more frustrating than any previous upgrade and I think it is mostly out of trying to force users into an online version of the software.