Can't update Chrome?

The latest update keeps giving me error 504 from the play store which I've googled and done the things suggested for the error. Wipe cache and data of play store. Remove Google account and log it back in. But still nothing so i manually downloaded from apk mirror and even that way says not installed when trying to update.

Any one have any ideas?

Sent from my Nexus 5 using Tapatalk