Yeah if you want to submit a support ticket I can look at these a bit closer for you, but if your host has looked at your PHP and Apache logs with no luck then my feeling is that the server specs you have are causing the issues which usually can't be overridden in most cases.
As far as the files are concerned you can run the installer file no matter what it is named. Those names are give to create security around the files. So since you have them posted online you might want to delete them and recreate new ones...
Hope that helps!
