Why can't I install Facebook Messenger on my HTC 8x?

[Windows Central Question]

cant install facebook messenger apps on my phone WP HTC 8X..

cant open messenger apps...thrice ive experienced it, the first two i just re-installed and does it was working...but the latest ive been trying for days now to installed the apps after finalizing it always goes back to download...have to repeat the process again...phone is upgraded with 8.1 OS...