Several players have had issues regarding the new update and Mumble not working. You simply need to update Visual C++.
(Vincent - I hope this helps!)
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Please read the following thread; http://www.realitymod.com/forum/f604-pr-changelogs/145393-pr-bf2-v1-4-12-0-changelog.html.
I have also copied in the important text:
Important, due to an update to the mumble client, make sure you have Visual C++ Redistributable for Visual Studio 2015 installed! Download it here. This is also for those who get the 'Mumble_app.dll error -3' error. You need the vc_redist.x86.exe even if you have x64 system.
Now follow the link given: https://www.microsoft.com/en-US/download/details.aspx?id=48145
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Follow these steps to download and install:
Step 1
Click download on the website
Step 2
Click next to vc_redistx86.exe then click next
Step 3
A pop-up should appear at the bottom of the screen and click Save as.
Now save the program onto the desktop and click save.
Step 4
Go onto the desktop and find the file (vc_redist.x86.exe)
Step 5
The following screen should pop up. Click the small box on the bottom left then click install.
Unfortunately I've already had this installed so I can only show the final steps - You just need to follow the prompts and finalise the installation.
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Hope this helps, if anyone has got any questions, feel free to ask!
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Special Thanks to DARKCOTTONTAIL:
"If you run into an issue when running the C++ installer that says you already have a newer version of C++ installed, you technically need to only uninstall the x86 version of C++ update shown in the following screenshot"
Special Thanks to DIGUELO:
"When updating the redistributable packs It is highly suggested amongst programmers that ALL redist packs from 2010 to today be installed for both x86 and x64 versions. The main reason is that calls to and from it usually assume youve been putting them in place since you were in the womb and consequently start looking for them in the drive. For the space they take up its worth it to have them all in place.
Those using VS 2010 and above check your updates for the changes manually dont expect Windows to do it for you. And any code you write I find is usually best written in one specific studio and specify what it is. OS only makes a damn if its not windows 10, but the more people that use the same syntax and compatability and redist packs will achieve better results.
Making a Self installer routine dont forrget the uninstall routine to clear everything out."