That pro upgrade hasn't been added yet. Hopefully, that and the remaining titles in red (Foo Fighters, etc.) will be made available when the PSN updates today, or along with the regular update on Wednesday.
I think Harmonix are aware that The Doors pro upgrades are missing from the AU/EU/UK Stores. I think they're just waiting for SONY to catch up with all the missing content during the "downtime" before they bombard them with requests to fix the rest of the missing upgrades, packs and tracks.
Ok the good news is that the guitar upgrade for rooster appeared.
The bad news is that I bought it and there's no download available, so I spent the money and got no goods, which makes me a pretty miffed customer ...