As of now, both the site on which VisElEchNon uploaded the tools, and the site on which Xenerkesdragon uploaded the Launcher itself, appear to be down. I do not know for how long they have been down, but they are.
Xenerkesdragon's page is archived on The Wayback Machine, but the download for the Launcher is not.
Thankfully, I have the installer for the "Lite" version of the Launcher saved on a CD somewhere (from when I initially downloaded it); I simply need to find it, and then its presence on the web can be restored.
In addition, I do not believe that VisElEchNon's .bat files will work with the current (i.e., updated since the previous activity in this thread) versions of the GOG installations of the games, as the installers have updated from 32-bit to 64-bit versions, meaning the default install location has changed from C:\Program Files (x86)\GOG.com to C:\Program Files\GOGcom, although this should be simple enough to remedy.