Use the installation manager to update.

CHANGES IN 4.1.0 RELEASED 06/10/2018]

NEW STYLE: 'Stop' is now available as a style and part type
added option to color brain elements by class (red=note-generating brain elements, blue=note-altering brain elements, green=play-filtering brain elements)
added 'Tom Grid' to brain 'Add' menu (use 1..5 keys to select tom)
OPTIONS-GUI: added toggle to allow double-click to delete in the bar editor
OPTIONS-GUI: added toggle for TV display in environment
added 'Quickstart Guide' to help menu
3D KIT: drumstick idle return target is now cross-sticking if last hit movement was for a cross-stick snare note
SSD4 Input Mapping: added missing hihat foot splash
Jamcussion now offers special styles 'Silent' and 'Import'
added 'Email Tech Support' function to HELP menu
if 'Allow Time Sig Changes' is not checked, changing the time signature in the host now triggers a song reset to adjust for the new groove weights of the new time sig
kick and snare now use 'Linked Edit'
SONG BUILDER: added 'Random Pick' to let ir randomly choose from presets for each part
hihat grid supports CC4 via CTRL+Wheel
fixed cursor not showing in data entry fields
fixed bar/beat not reflecting visual bar offset
3D-KIT: fixed motion-blur drum sticks occlusion issue when viewing kit from the front
fixed MIDI key display not updating when clicking in the 'Kit Piece' list while an articulation is selected
fixed problems with preview function in the load kit dialog
fixed second snare logic not switching snares under certain circumstances
fixed sliders in event filtering brain effectors not showing current value in status line
fixed China 4 placement if rack is active and no other left side kit piece is present
fixed UI error in jam options screen when changing input velocity map
fixed Jamcussion kits always loading to output #7 regardless of user setting
CUBASE: fixed dialog alerting to missing pak in style, player and kit load dialogs opening behind load dialog
fixed ride cymbal assignments in output

If you learn how to use it, this is great software. It's what I start with now. No more looking through midi loops to get close to what I want. I can get the feel almost immediately.

Jamstix was one of the things I lost when my computer was stolen, and I miss it. Given that an upgrade from any previous version is just $49, I'm tempted to go ahead and get it again.
 
Never got into the auto-jam feature, even though that's its main selling point. Mostly, I used it as an alternate sound source, mainly its percussion pack for shakers, tambourines and such. It also had some nice dry kicks. It's actually pretty good just as an all-around drum sampler or sound source for layering under other drum libraries.

For some songs I like the Jamstix sound. Other songs I run it to AD2.

I have the Jamcussion add on, but haven't used it much.

I just find it much easier to get the general feel of a song using Jamstix4. I can use the Bar editor to get the general beat going. Then with the swing settings get the feel right. I use that bar to make a new style and then select a drummer and let him play.

It really is worth taking the time to learn it. I am still learning new things about it. It really is very flexible with using other VSTi etc.

If your computer was stolen - have you reached out to Ralph? He is very reasonable and provides great customer service.

I agree with gmon. Ralph has a record of purchases, he may be able to help out.

I think the potential on this thing is HUGE; but I just never really have hunkered down with it to learn it.  I guess I should!

they have a page were you can request license and download link, did you try that? https://www.rayzoon.com/support.html

piling on - I use Jamstix (still using 3, need to upgrade) all the time, but still feel like a novice. I too use the measure editor to get a basic rhythm and then use it as the basis for a style.

The included sounds are better than they have any right, but I still end up using Jamstix to drive Superior 2. What an amazing combo!
 
I do miss the direct integration between Jamstix and Superior.

I like the Jamstix 4 interface because it's easier for me to read. 
Jamstix is a wonderful tool! Spent time playing with it cuz it's worth the effort. 
 
Dave - Please contact Rayzoon Support