Keep in mind that these methods might not provide the exact version of avformat-59.dll you're looking for, and you should ensure you're downloading from a trusted source.
By following this guide, you will not only fix your error for free but also protect your PC from malware. If you continue to experience crashes after placing the correct DLL, the issue may lie deeper—consider updating your graphics drivers or checking for corrupted system files using sfc /scannow in Command Prompt. avformat59dll free