Download and extract using a 7z extractor to your desktop. This 7z extractor is recommended. Open up the folder and copy all the files inside and paste them directly into rio/data. This will enable the option to play IB VGR on the alexander.exe.
Create a shortcut of the alexander exe and paste this on the end of the target line.
The percentage of decrease in campaign loading times will vary. For me it is a decent 38%, for some it may be up to 85%, others perhaps only a slight 15%.
Examples of animation pack I have been working on.