I checked and the map is not showing for me, nor do I have the gold skin.
I just downloaded and installed the Imperial Edition for the Larian Vault version of the game, and I have the Planet Earth map listed for both multiplayer and single player custom campaigns, and the gold dragon skill shows up in a skirmish, at least. I didn't have to run it as administrator, though it did default to installing in the Program Files path even though I changed where the game was installed; after I changed the install path to match the game's '..\Dragon Commander' path, it put the concept art, screenshots, docs and soundtrack in the '..\Dragon Commander\ImperialEdition' folder.
Try just moving the ImperialEdition folder into the Main folder, rather than Dragon Commander. When I changed the default install location I dropped the 'main' from the install path. The game could just be expecting the relative paths to be set:
(default) (my install path)
Dragon Commander or Dragon Commander
Main Data
Data ImperialEdition
ImperialEdition Plugins
Plugins Shipping
Shipping
rather than
Dragon Commander
ImperialEdition
Main
Data
Plugins
Shipping