I have multiple instances of VT installed in Win 10 under multiple users. I noticed that only one instance can run at the same time.
Starting the second instance in a command prompt will not print any error, however it doesn't start, probably they're trying to share the same resource (possibly a port or socket? because the data folders are different).
Can this be fixed in a future release?
2008 Cosmic Blue Mazda 3MPS
Built engine + WMI + GTX3071 gen2, ~550BHP @35PSI
2008 Icy Blue Mazda CX7
Built engine and stock exhaust (YES!!), JBR3" + GTX2867 gen2 + Autotech HPFP, self-tuned to 360-ish BHP
This is by design. VersaTuner only allows one running instance to prevent multiple instances from trying to modify a single database. We can add a command line switch that will allow you to start another instance when necessary.