These videos will answer your question about installing your own vsts. They are published by Isla Instruments themselves and are - to my knowledge - the ones which exists, and therefore the best way to obtain the knowledge you are seeking, and answers to further questions which might arise. The upper one is the newest update:
There is also a longer user-thread on the forum discussing the technical aspects, possibilities and limitations:
Don’t remember if differences in prices for pre- vs. later-order is mentioned in any of the above though.