Dimensions is not currently compatible with Windows 11. We are waiting for an update from our team for when it will be compatible. This article will be updated as soon as we have further details.
If you are a Hosted customer, then your own operating system would be irrelevant in this scenario. This is due to the Hosted envrionment being run off the server envrionment, and therefore will use whichever operating system is on the server that is Hosting it.