To download "better," you must stop using random YouTube links. These are often riddled with adware.
This usually means your device doesn't meet the RAM requirements or the APK is corrupted. Try redownloading. If you'd like, I can help you find: The official community links for the Better server. Instructions for playing on PC using an emulator. A list of other popular servers like Rawr or TNA. Which of these how to download msm private server better