Pardon if this is OT; but if you want to use the tester without being phsically connected to your PC you could try a ESP8266 module with ESP-Link firmware and a virtual com port.
Set ESP-link firmware to 9600 baud and 8E1 parity. (Not the "normal" 8N1!) And establish a virutal com port with HW groups VSP (single port version is free for personal use).
Downside seems to be that it requires futher trickery to work properly. I had to "overwrite" one of my bluetooth COM ports with the virutal one (no idea why that was allowed, its not allowed with non bluetooth ports) as the only ones listed in EB software are other Prolific2303 serial ports and bluetooth ports (and only COM ports below 20?). Alternatively its possible to start EB tester software, and remap the prolific COM port, and then create a vitual with the same number; pain in the * to do each time you start the EB tester software though.
Just wire the ESP8266 in parallell with the PL2303 chip, providing it with 5V, GND and take the Tx/Rx pins over to the ESP8266 and off you go.
Both ESP module like wemos d1 mini and the PL2303 use 3.3v logic level, but probably better to supply 5v than 3.3v to the PL2303. (or more to the point, not load the PL2303 3.3v regulator with the ESP)
I soldedered from PL2303 to Wemos D1 mini:
Pin 1 to GND
Pin 2 to Tx Pin 7 to 5v
Pin 4 to Rx
(Or just get a 3.3v HC05 module and wire that in as well, might work without trickery but I havent tested it. PL2303 pin 8 has 3.3v output for a BT module - provided PL2303 is fed 5v ofc)