We will be providing a free-of-charge compatibility update for the RJ Professional to make it MSFS 2024 compatible post-release. This will be available to all users, regardless of which store the product was purchased from and no additional purchase will be required.
We can't guarantee that the compatibility update will be available on day one as we will likely need time to test the product on the release version of MSFS 2024, but it is in our best interests to get the product MSFS 2024 compatible as soon as possible.
Mark - Just Flight