The update is so far available only in Turkey. LG G4 Beat (aka LG G4S) owners in other country or area should receive the Android 6.0 Update in a few days.
How to Update LG G4 Beat or LG G4S to Android 6.0:
Download and install the LG Mobile Support Tool.
Launch the LG Tool
Connect Your Phone to PC via USB Cable
LG Tool should notify you that there is a new update.
and then follow the on screen instructions to upgrade your phone.
Or You can download the LG G4 Beat H735 Stock Android 6.0 firmware – KDZ File from LG Server.
Here is the download link: H735TR20a_00_0224.kdz
The source code of LG G4 Beat H735’s V20a firmware is also available now on LG Open source code website.
Source: LG Open Source