Important: Try to keep your OpenIV updated, some older versions have issues with the packages.
*Keep in mind that ScripthookVDotNet still needed for my mods, and it need to be installed/updated manually.
1 - Start OpenIV and click in GTA V windows, case it asks for game location set it.
2 - Click in Tools > ASI Manager, make sure that OpenIV.asi and ASI Loader are installed:
3 - Click in Tools > Package Installer:
4 - Select the .OIV file and click in Open:
5 - A window similar to this one should appear, click in Install:
6 - Now OpenIV will ask if you want install in mods folder or in original game files, i recommend to choose mods folder option to make easier disable the mods when going to play online:
7 - If everything goes well you should see the "Installing" screen and after some time the "Installation Succeed" screen, the installation time may be longer depending on what RPF files OpenIV will need to handle :)
Issues with ScripthookVDotNet or Ctrl+N menu? Check this post