Hello,
After reading the thread on github about .net 8 support, I decided to target .net 6 with RollForward LatestMajor in order to use the latest runtime while still remaining compatible with other add ins targeting different versions of .net.
When I try to load the add in into Excel with no other add ins enabled, I get an error that .NET Desktop Runtime 6.0.2 can not be found which is accurate because it isn't installed. However, I do have .NET Desktop Runtime 8.0.1 installed so I would expect my add in to be trying to load that and not 6.0.2.

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I created a console app targeting .net 6 and set RollForward to LatestMajor to test this issue and see if it was .net related, but that worked fine so it has be an issue related to Excel or ExcelDna somehow. If you have any ideas or suggestions, please let me know.
Thanks,
Josh