I'd advise you to just use the TV's onboard 2D->3D converter if you want to watch 2D movies in 3D. (And BTW, I have an LG 65LW6500 3DTV). Use the TV's 3D depth adjustments. The TV's on the fly conversion will very often not get things quite right, leading to odd effects, but that's how it is. The more you dial up the depth adjustment, the more obvious will be the errors. When I say errors, I mean things will not be placed correctly in background or foreground.
Think about it. Millions of dollars are spent in post-production to convert 2D movies to 3D. To do it right requires a lot of work, much of it being convergence adjustments. No program presently can do a decent job of it. Besides which, all the programs I'm aware of output either a SbS (side-by-side) or T/B (top bottom) file, which halves the resolution.
Anyway, you can try DVDFab, which offers a free trial. IMO, it doesn't do any better than the onboard conversion, even discounting resolution loss. But it won't hurt to try, if you're determined to find out for yourself.
Good luck and welcome to the forum.