First off, Welcome to the forums

I don't know if I can convey this properly but I will try for you.
When we flash, or install the flash package to our computers, it makes a duplicate of the install and actually tries to use the mirrored copy which will always point to a stock rom over the one we want.
So, now that you installed the flash program to your pc, surf to...
Computer/C:/Program data/LGMobileAX/smartphone setup.
(Program data is hidden by default, will have to uncheck hidden folders in folder options)
Try using the flasher in there, run it as admin and turn off your Anti-virus if you have more issues.
As well, let us know how it goes.
I hope that helps

WR