If you are looking to install this, the safest method is using Geode. Do you want a recommendation for a specific mod for speedrunning, or OpenHack - Geode
It is highly recommended to use this mod while disconnected from the official Geometry Dash leaderboards to avoid account bans. skacat- Geometry Dash Noclip Mod Menu 2.2
Geometry Dash Noclip Mod Menu 2.2: How to Download and Master the Game If you are looking to install this, the