The new prototype installer needs to be pointed at the Final Fantasy VII folder instead of the data folder to catch the .EXE; I'll check the text in the installer in case it still asks for Data folder.
Ah, so that's why. Just tried that and it installed perfectly, thank you. Also, regarding some of the information files included with the installer, some of them are a tad outdated. ^^;;; Aside from how the installation instructions were still telling me to install in the data folder, there were other things like how the enemy list has some outdated information; for example, it mentions the X-ATM Scorpion fight in Corel Desert, despite the fact that fight has since been moved to Mt Nibel, yet the file never told me that which left me quite confused. Also, where exactly is Vincent's Supershot ST, his triple AP weapon, located? The "where do I find it" file mentioned how it was in Ancient Forest, but that's only up to version 1.4. It's not there anymore in 1.5 (it was replaced by the Wizard Staff) and I never found the weapon ANYWHERE throughout my entire playthrough.