For at least months when I joined here I saw the forehead ring on the Umbreon in your signature as a fucking disproportionately large and discolored eyeball and the image didn't make sense to me until I realized...it was a fucking Umbreon. Which shouldn't have been a "realization" in the first place, but hey.
1. Deletion of all vanilla maps will corrupt the mod executable.
2. The built in guides do not work on Windows 7.
It's also been packaged with redundant stuff like JRE vs No-JRE, and a version of BL was included that allows four layers of tiles to be used, even though there was no hack publically distributed for the feature, making it useless.
v500 can already do everything that v511 can do, including modding CSE2, it is more stable in terms of the programming, and if you are scared of not having the hackinator hacks in the version, you can always transfer the hacks folder to the new directory, Hackinator has been a feature since v404, there is no reason to think why the xmls can't be read. And even if you want to mod Cave Story + (even though it's been severely recommended against doing so), v451 can still do the job.