This has already been described but maybe this will help folks understand a bit better (it is a little confusing).
Also I am basing this on my previous knowledge of included AD1/2 packages that have been included with Sonar. Somathing MAY have changed since but I think this infor is still current.
Addictive Drums (version 1) was a standalone package that included 3 built in kits (AFAIK). You could BUY extra kits and expansion packs called ADPaks (sample libraries for other kits) and MIDIPaks (genre specific MIDI loop libraries... some of which were designed/recorded to complimet specific kits but can be used however the user wishes).
Addictive Drums 2 (the current version included in Sonar Pro and Platinum) does NOT include any kits on it's own. AFAIK you cannot even own the AD2 engine on it's own. What you do now is you BUY one of the ADpaks (sample library of a specific kit) and the AD2 engine comes with it. Not sure if it comes with an accompanying MIDIPak but you can buy MIDIaks separately as well.
So previously you bought Addictive Drums and it came with 3 kits. Now you buy the kits and you get Addictive Drums.
In the Sonar AD1 packages you just got AD1 with the included kits.
Now what you get is essentially is a redemption code/coupon with your Sonar Platinum purchase for 3 ADpaks and 3 MIDIpaks and the AD2 engine comes free with those "Paks".
Any extra packs you bought for Addictive Drums 1 will not load in Addictive Drums 2 (AFAIK) nor will the kits that were included with AD1. TO make those previous kits/purchases work in AD2 you need to pay a fee to "upgrade" those kits so they work in AD2 (but it will migrate ALL your kits for one price IIRC... including the original AD1 kits).
Otherwise you would have to buy each kit individually again to use in AD2 (at more expense) including the original AD1 kits (which are now also for sale separately for AD2).
So in your scenario you would (again only AFAIK) have to PAY to upgrade your INDIE kit Pak to work in AD2... but it would migrate any other AD1 kits you have as well.
Otherwise you could use one of your Sonar included AD2 ADpak rebates to redeem the AD2 version of the INDIE kit if you don't want to pay the all out AD1 kit upgrade fee.
It's really quite a twisted and convoluted upgrade logic but whatever. It's a decent program and nothing stops you from using AD1 and the older kits whenever you want. You just can't run them through the new engine which isn't, IMO, a huge deal. That's why I focused on getting more unique kits with my redemption codes.
What I'm wondering now thoug is since I've upgraded again (to lifetime) whether I get an EXTRA 3 AD2 codes for this purchase?
I haven't checked yet but that would be wicked cool. Then I could get my grubby paws on those Jazz packs I was ont he fence about last time.
Cheers.