What a bummer, it's not letting me access Jamcussion. I installed it successfully from the kit window as instructed, and put the license key file they sent me in the location they instructed (my VST folder). But when I try to access Jamcussion it says my license is not authorized for it. 
 
I'm also a little confused because when I first installed Jamstix I was told to keep my license key in the same place as the Jamstix data (kits, MiniPaks etc) and this is what I did. But these new instructions tell me to place it where my jamstix.dll is. Anyway, I've tried both locations and none result in the unlocking of Jamcussion. Anyone have any ideas? I've emailed support but maybe I'll get a faster answer here 

I don't have JS3 (I'd love to upgrade at the discounted price but I'm too poor right now), but in JS1 and JS2 you had to install new kits via the JS UI. On the Kit tab there's a button labeled "INSTALL PAK".

bitflipper
I don't have JS3 (I'd love to upgrade at the discounted price but I'm too poor right now), but in JS1 and JS2 you had to install new kits via the JS UI. On the Kit tab there's a button labeled "INSTALL PAK".

Yeah it installed OK, but I can't access it because it says my license doesn't authorize it. But I'm using the license file that Rayzoon sent me along with my Jamcussion download link.

I am sure I followed the directions given in my email:
The attached file (jamstix3_license.rztlkf) is your license key file. Copy it into your Jamstix plugin folder (where jamstix3.dll is) after installation to activate Jamstix and any expansions you may have purchased. Keep a backup copy of this e-mail and all your downloads in a save place.
I found the license was no longer in the VST directory but relocated to C:\Jamstix3 above the bin and data directories with a few other files (e.g. jamstix3.def, PakInst.exe, the uninstall stuff) . Maybe that is where it goes now.

Yeah they just sent me an email saying that's where I should put it. I forgot there was a C: level Jamstix directory. I guess I must have put a copy in my data directory as a backup. Apparently it used to be stored alongside the .dll but they change it ages ago. All this time later, they're still sending out the wrong instructions in their emails. Bad form Rayzoon! Honestly this software is great and customer support is usually swift and helpful but overall presentation needs some work....

So it seems that I don't have a C:\jamstix3 directory. For me it's located at C:\ProgramData\jamstix3.

I believe Jamstix 4 is on sale at present for $59. I have always disliked compiling a drum track from midi files so Jamstix, from what I have read, could be a good option. However, I believe there is a learning curve - is there a resource apart from the manual that will teach me? I’ve a Groove 3 sub, but they don’t seem to cover it.

JS3 allows you to just use its brain and a 3rd party program’s sounds if you want. Very clever.
It can also take your audio out as an input and derive a tempo and dynamics map in real time and play along with you.

Hadn’t heard that 4 was out but no money for musicing at this time. Boo hoo!

Marshall
I believe Jamstix 4 is on sale at present for $59. I have always disliked compiling a drum track from midi files so Jamstix, from what I have read, could be a good option. However, I believe there is a learning curve - is there a resource apart from the manual that will teach me? I’ve a Groove 3 sub, but they don’t seem to cover it.

 
These tutorials are for Jamstix 3, but still completely relevant:

Thanks Mark. Still trying to decide which pack to get.
I wanted to get XL but also want Jamcussion but it seems more cost effective to go the whole hog and get Studio.