I am using plugable UD-3900. Connected my 2 monitors succesfully via plugable UD 3900, but when i try to connect my 3rd monitor using USB To VGA adapter and its drivers to the device(mentioned in below link). I get error stating " You cannot use the 3rd party drivers as there is conflict between current display drivers and install drivers and suddenly my two working monitors also stop working.
Graphic Drivers used:
Fresco Logic USB Graphics Adapters
Please let me know how I can use the current USB TO VGA adapter without investing on the new adapters.