Regarding the files you posted, they seem to indicate a cross-platform installation, rather than the windows installer.
Regarding your latest installation problems. Are you in the Tersus Modelling perspective (the best way to check i by looking @ the main window title which should start with the name of the perspective currently displayed).If not, switch via Window -> Open Perspective.If you are in the right perspective, try Window>Reset Perspective...
If none of this helps, please retry installing (making sure the target folder is completely empty - do not install over an existing/uninstalled installation), and if that still does not help, reply with the error log I mentioned in my previous post (I suggest you use the Add an attachment button to attach it rather the pasting it into the message).
For best results, use the Firefox browser..