Always run a .jar or .zip file through a scanner like VirusTotal before moving it to your .minecraft folder.

The challenge for the future is the rise of server-side anti-cheat systems (like XIGNCODE3 and nProtect GameGuard). Modern Haru repacks include "bypass patches," but these require frequent updates. If you download an older Haru repack (pre-2023), it will likely fail to connect to servers using modern anti-cheat.

Paste these folders directly into your primary .minecraft directory.

Which (e.g., 1.20.4, 1.8.9) are you targeting?