The Complete Edition includes Grand Theft Auto IV and the Episodes – The Lost and Damned & The Ballad of Gay Tony.
was $29.95, now $8.98
YMMV - On first boot of the game, the game would not recognise my dedicated GPU (GTX 1050 ~4GB) and was limiting the settings based on my integrated GPU (i7 8700T). After reading some forums, watching some YouTube fixes, and trial/error, what seems to work for me was adding the commandline.txt to the GTAIV install directory and entering the GPU available that's mentioned in your dxdiag. Afterwards, I had more options to enhance/change the graphic settings. Despite the game now recognising the GPU having ~4GB, if I cranked up all the graphical settings, it would get quite messy - unrendered walls, floating cars, weird shadow glitches. Hence, I found the sweet spot was using Auto Configure and then making a few minor changes thereafter. Now getting an average of 60fps with a few dips here and there, but feels much smoother than when I was playing it on the PS3 back in the day. Yes, it isn't a fantastic port, but for $8.98 and a little bit of tweaking, it's not bad.
ps - my commandline.txt in the GTAIV folder read something like this…