Follow the below steps to install Apex Launcher app and Themes on your Android phone
Download Apex Launcher on your Android Device from the Android Marketplace.
Register on eSeth for a free Account. Login to your account. Download Theme from eSeth.net via PC Browser or via your Android Browser.
Step 3a (Downloaded on PC and transferred via USB drag and drop) - Skip Step if using other method of transfer
If you Download the theme from your PC Browser, transfer the theme to your Android device via USB or via Bluetooth. After the transfer is complete browse to the location of the transferred theme file via your Android default File manager or a third party file manager like AndroZip.
Step 3b (Downloaded on PC and transferred via Bluetooth) - Skip Step if using other method of transfer
Transfer the file via Bluetooth and accept receiving from your phone. After the transfer is completed check notifications.
Step 3c (Downloaded on Android phone via Android default or Chrome Browser ) - Skip Step if using other method of transfer
From your Android default or Chrome browser login to your account on eSeth.net. Download the desired theme.
Tap the file to install.
After installation Click Open. This will launch Apex Launcher and take you to the Theme Settings Screen.
If you get an installation error make sure you have ticked marked " Unknown sources - Allow installation of non-Market apps" in settings - security.
Tick Mark what you want to apply from this theme file. Theme APK may contain custom Icons, Wallpapers, Skin and Fonts.
You are done. You can now setup the Launcher Screens as you normally would with the default Launcher and customize it your way. For example you can have multiple widgets or shortcuts on your screens and also have multiple screens in Apex Launcher. For more information about Go Launcher check the link below.
More information about Apex Launcher App: http://eseth.net/blog/469/go-launcher-and-apex-launcher-faq