Apps installs via flashing your Android

Some ROMs have added features that are
available to flash.
1. To Flash the App/Rom Feature you must first
download the .zip file.
2. Mount your devices SD card and copy the .zip
file over.
3. Boot up to your devices custom recovery.
4. Wipe your Dalvik-Cache in the Wipe Menu. And
then go back to the recovery's main menu.
5. This step may vary per device, there should be
an option that says "Flash .zip from SD Card",
select it.
6. Select the .zip file you wish to flash.
7. Confirm flashing of .zip file.
8. Wait for the file to flash; and if successful,
reboot.