If I follow you’re path, once I get to Roaming, there is no Dynamo.
Create the folder structure then if it is not there, and put the package there and let us know if it works.
My feeling is that there could be a embedded path somewhere looking into your %AppData% folder for the relevant files but of course it cannot find it so therefore not loading.
I had a similar issue where any package that had a dll wouldn’t show up on some of our company computers. It turned out to be a permission issue, and it was resolved once our IT guy gave everyone read and write permission to the folder where all the packages are stored.
Thank you! I’m hoping this is the case. I contacted my IT dept. yesterday, so hopefully I get a response soon.