Install the Library

1. Make a folder

First off, make a folder for LSL libraries if you don't already have one. Such as C:\LSL

2a. Using Git

Git clone https://github.com/JasXSL/ObstacleScript into your LSL library folder.

2b. Manually

Go to the repo, click the download button, and download as zip. Extract ObstacleScript-master into your LSL folder and rename it ObstacleScript.

3. Setting up inside SL

1. Create a new script and open the script window.
2. Click the cog icon
   
3. Check Enable LSL Preprocessor, script optimizer, #includes from local disk. The rest of the settings are optional.
   

You're ready to go!