Thank you kindly for the reply nickrose.
I exhumed an old (ancient) PC and successfully applied the update. 
One additional, potentially causal, detail I neglected to mention is that the PC I initially used (detailed in OP) does not have a serial port and I am utilizing a USB-to-Serial converter (TRENDnet U-S9). Are there known issues with this type of connectivity?
I am receiving the following error via VSig upon executing "Get Dbase":
"Get User Files" & "Get Setup" both work without issue.
