This is an the OTA package for Cosmo Communicator Android (NOT rooted) firmware, V25.
You must be using Android V23, which you can get from here (using Fastboot to flash - the bootloader must be unlocked!), or from here (using the custom multi-boot recovery functionality to flash; requires V19 FW minimum).
Attempts to update from any Android firmware version OTHER THAN V23 are not supported!
You should also be booted into NON-rooted Android on your Cosmo Communicator. Remember to flash the V25 rooted Android boot image when the OTA update is complete.
You need to download this file of the V25 OTA.
The ZIP file should be named 'Updatepackage.zip' - all one word - and copy it to the internal Cosmo storage. This should not be the SD card. It must be internal storage, and in the top-level directory (also known as: root-level directory) of internal storage.
The ZIP file can be installed by going to the usual 'Wireless Update' in the Cosmo Settings on Android. Once you get to that screen, tap the top-right menu, and click on 'Install from local storage'. The OTA updater should automatically find the correct file, if it has been copied correctly, and prompt you to update.
When your Cosmo is plugged in, and has enough battery, begin the update.