For others who may encounter this issue:
These are the steps which I found worked:
1. Search C:\ for "wintab32.dll", this is a Wacom driver packaged with windows (I thought it was the Windows Standard pen driver, but it is not!). You must remove this .dll file for the Bosto Kingtee 19MA tablet to work in Photoshop CS6 in Windows 8 or 8.1.
Also: There are two instances of this file in windows! Be sure to only remove the one in Wow64, not the one in the System32 directory. (I'm using a 64 bit OS, and I'm not going to make any assumptions about this situation in a 32 bit environment.)
2. Run the TouchPanel Bosto driver installer again, this replaces the Wintab driver... apparently somehow...
3. Manually Install the following updates for CS6: (do not use the Application Manager, it doesn't seem to catch these updates (on my system at least))
(Starting from the bottom with 126.96.36.199 and going up in order by date)
Adobe Photoshop 188.8.131.52 update for CS6 26.2MB 11/7/2013 Adobe Photoshop 184.108.40.206 update for CS6 26.1MB 6/3/2013 Dynamic Link Media Server 1.0.1 Update for Windows 36.5MB 10/8/2012 Adobe Photoshop 220.127.116.11 update for Adobe Photoshop CS6 22.6MB 9/27/2012
4. Restart Computer after the 18.104.22.168 update per the dialogue box's request.
5. After the 22.214.171.124 update is installed, the Bosto tablet should be working in Photoshop and Win 8.1!
Pressure sensitivity-controlled brush size might not work particularly well, HOWEVER the pen input appears sufficiently functional enough for applications such line work and basic tap-equivalent-to-left-mouse-click functions (which is all I need it to do anyway). There may be some other settings pertaining to pressure gradients, but at this point I'm just glad to have this input tool back!