OBS – Open Broadcaster Software is a freeware program for live streaming and recording. You don’t need to store your gameplay moments on your hard drive anymore. You can easily connect OBS to Twitch and store online as many videos as you want and also you are able to live stream your games over the Internet. OBS provides you with a lot of features, however sometimes it gives errors when you try to launch it. The most common error is d3dx10_43.dll is missing error.
d3dx10_43.dll is missing error in OBS are usually happens because d3dx10_43.dll library is damaged or quarantined by an antivirus and is not accessible. You might try to reinstall DirectX, but your antivirus might remove the d3dx10_43.dll file once again during the installation. So, we recommend you to download and install d3dx10_43.dll library from here: http://fix4dll.com/d3dx10_43_dll. It is a genuine library provided by DirectX. Simply download and copy it into the Open Broadcaster Software default folder. This should fix your d3dx10_43.dll is missing error in obs.