How to prevent installings that are not from you (without Permission Changing)
 

It's a good tip to anyone which want to make install pages private, but can't change permissions.

1. Go to the CPanel of your web hosting, it's this page actually:
   http://orig14.deviantart.net/cadd/f/..._1-dbgt5ko.png
2. Click on "Directory Privacy". You'll might see this.
   http://orig12.deviantart.net/6758/f/..._1-dbgt5u2.png
3. Select the site you want to protect.
4. After selecting it, click "Alter Protection" and put "install" in the blank field.
5. Now...
   http://orig12.deviantart.net/3c61/f/..._1-dbgt6lv.png
   Ps: These login fields on the bottom corner haves my native language, ignore it.
   http://orig00.deviantart.net/1d54/f/..._1-dbgt7fm.png
   
   VÒILLA! Now only you can install on your site.