Rumor has it that Satworks ceased operation perhaps about a year ago. Around the time I heard that rumor Skyvison had a clearance sale and was almost giving the 3618 and 3688 away, also their software upgrades disappeared from DMSI. So..................what you have is what you will have to work with.
You might try upgrading to st3688, I belive Jim did this awhile back, I don't know where You could get the upgrade software to do a 3618 to a 3688 unless someone still has it on their PC.
I have 2 st3688, I personally like them, here is a link to some software for the
st3688, if You decide to upgrade to it