If you tell me you're using or specific features you miss from 360 Launcher, I can suggest a modern, safer alternative.
If you are looking to download the APK, you can find various versions—including the "Pro" build—on community-driven sites: skachat 360 launcher pro
Searching for can be a bit tricky because the official developers (Qihoo 360) stopped updating it several years ago, and it is no longer available on the Google Play Store. If you tell me you're using or specific