Check the MD5 checksum (if provided by source) to ensure the download isn’t corrupted. Corrupt zips fail to flash or cause bootloops.
: If performing a fresh install, a "Wipe Cache" is often recommended. Flash : Select Install ZIP from SD Card . Locate and select the Gapps ZIP. Confirm the flash. Official Gapps For Android 4.1.1 Jellybean Flashable.zip