1) The base is located on Yellow Jack in Paleto Bay
2) Installation:
1.Install Map editor.
2.After installing Map editor, transfer all files from the archive to the path: folder with GTA 5 \ Scripts. If there is no Scripts folder, then create it.
3. Download the map from the website. After that, transfer the file to the folder with your GTA 5
Credits:
Frannchesko