The most awaited MIUI 8 Global Stable Version V18.104.22.168 LHJMIED for Redmi 2 Prime is being pushed to random users. The Update will be pushed through OTA, if you haven't got any update on your device no need to worry. Just check again in a while. Those users who have received the update and updated their devices, provide feedback about the update in this thread.
Note: Update will be released to the all users after a successful testing of the ROM. Do not Leak or Share the Changlog or download links of the Nightly's Stable ROM.