This forum is for Technical Support on Blizzard’s Classic Games and the Battle.Net Desktop App.
For Call of Duty games, Blizzard support is limited to purchasing and installation. For all other issues such as this Warzone error, you must contact Activision Support at https://support.activision.com .
This Link is from Battlenet and is dedicated to Warzone lunching error. Is not possible that every time Waerzone have a problem, Activision send us to this Forum and in This Forum You say that is not your problem!!!
I have the same problem with the Battle.net launcher trying to launch Warzone. There is no “play” button, only a big blue “update” button, but when I click the “update” button I get the message “Whoops! looks like something broke. You could try restarting Battle.net”.
If I scan and repair, it takes 20-30 mins and then pops up the same “Whoops!” message.
I’ve also tried deleting files from the Warzone install location (all IDX files, everything under 2MB in data folder + everything outside data folder), then Battle.net automatically starts a repair update, ending with the same “Whoops!” message.
I fixed this issue on my PC - I think the issue is battle.net struggling to install the Ricochet anti-cheat because it’s kernel level and requires administrator access. Whatever the problem was, this is what I did:
I went to my battle.net install area (for me it’s the default):
C:\Program Files (x86)\Battle.net
Right click on “Battle.net.exe”, go to Properties, then in the compatibility tab, make sure the “Run this program as administrator” checkbox is checked.
I did the same for “Battle.net Launcher.exe” in case that makes a difference.
Then I opened battle.net and it immediately started an update. After the update, Warzone was playable.
Go to C/Games/Call of Duty Modern Warfare, right click ModernWarfare.exe and Modern Warfare Launcher, Settings and then Properties and set them to always start as admin.
Now locate your Battle.net folder and do the same to the Battle.net.exe and Battle.net.exe Launcher. Make sure that these files are not just shortcuts.
Now go back to C/Games/Call of Duty Modern Warfare and Go in to Data/data
Order the files by size and delete all 0 or 1 kb data files, called like data.256, data.257 and so forth. Make sure you only delete those by 0 or 1 kb size. I had around 20 of those but it varies.
Restart Battle.net through Battle.net.exe and watch how that hideous Update button turns to a beatiful Play button and Voila
Cred to u/GTnik for making me try this