If there are no presets showing in OCTANE or you're having troubles downloading fro the OCTANE Store, follow the steps below:
Make sure you're on the latest version of OCTANE which can be downloaded here
Open OCTANE
Click on the OCTANE logo at the top left
Click Move Content Storage
Choose a folder you have access to (Preferably something like ../Documents/OCTANE)
After you set that, go back to the OCTANE Store and try downloading a sound pack!
If you try this and it doesn't work click on the OCTANE logo at the top left again
Click the red "Reset Octane" button (This will delete all data)
Return to step 3