Capcom shared a big batch of Monster Hunter: World videos with an overview look at all 14 weapon types with details on how they play.

Version  398.82 - WHQL
Release Date  Wed Aug 01, 2018
Operating System  Windows 10 64-bit
Language  English (US)
File Size  489.99 MB

Game Ready
Provides the optimal gaming experience for World of Warcraft: Battle for Azeroth and Monster Hunter: World

Support For

    Monster Hunter™: World
        Up toto 5% faster performance using Radeon Software Adrenalin Edition 18.8.1 on the Radeon™ RX Vega 64 (8GB) graphics card than with Radeon Software Adrenalin Edition 18.6.1 at 1920x1080 (1080p)1
        Up to 6% faster performance using Radeon Software Adrenalin Edition 18.8.1 on the Radeon™ RX 580 (8GB) graphics card than with Radeon Software Adrenalin Edition 18.6.1 at 1920x1080 (1080p)2
    World of Warcraft™: Battle for Azeroth
    We Happy Few™
    Madden NFL 19™

Add -nofriendsui -udp

OR

-nofriendsui -tcp

On Launch options, as confirmed by chinese forums. This is the short answer.

Slightly long answer
according to our experiment the -udp switch works far better than -tcp, but YMMV. Apparently some ISP performs better than the others. Also switching to wired connection can help.

Here's how this works (as translated from the op. Credit wu360463231 in Steamcn forum):

The multiplayer is based on P2SP (peer to server and peer), in which players has to keep connections with other players and also Valve server.

There are Valve servers in Jiangsu, Hong Kong, Japan, Singapore, LA, and other regions. The server you connects to depends on the host. [...]

Error code 83: you are disconnected from Steam (Valve) service. (n.b. this is the case when you see bunch of Steam popups that your friends "started" playing games at once)

Error code 5038f: P2P host are d/c or is experiencing interruptions

If the host are d/c, all members in his/her server will be d/c and see 5038f error.

Solution: force Steam to use older Friends UI, which is based on an older protocol rather than WebSocket found in the new UI.

Hope this works for you.

Search Backup Settings > More Options and Select your save folder. Make the option as Daily.

How to Restore? Go to Control Panel. Click File History. Click Restore Personal File and search for the one before it was problematic.

Status Update: Connection Error Issues

The following fixes have been made in regards to the connection issues:

    Fixed an issue where error messages would display and kick players offline when searching for online sessions. Also readjusted the matchmaking function to make it easier to find an online session via "Search for an Online Session" > "Matchmake".

    Fixed an issue where error messages would display and kick players offline after having joined an online session.

    Fixed an issue where error messages would display and kick players offline while playing multiplayer. This adjustment reduces the number of occurrences, though it does not completely resolve the issue. We will continue to investigate this matter.

    Fixed an issue where the error message "E_FAIL : hr" would display and the game would crash when switching to full screen mode.

Important: You must update to the latest version of MONSTER HUNTER: WORLD to apply the fixes above. The latest version of the game is revision number 151910. You must close and reopen the game for the update to take place. You can verify the version number in the top-left corner when you launch the game in window mode. Keep in mind that you can only match with other players who have the same update version as you.

For other questions, please visit the official MONSTER HUNTER: WORLD support portal below. http://www.capcom.com/mhwsupport/

We apologize for the inconvenience caused by the persisting connection errors. Fixes for the remaining issues continue to move foward, and we plan to release another patch on September 6th, 2018 at 0:00 (UTC). Details regarding the patch will be posted at a later time. Thank you again for your patience in this matter.

Important: The latest version of MONSTER HUNTER: WORLD is revision number 151910. You can verify the version number in the top-left corner when you launch the game in window mode. Keep in mind that you can only match with other players who have the same update version as you.

For other questions, please visit the official MONSTER HUNTER: WORLD support portal below.
http://www.capcom.com/mhwsupport/