This post I am going into how to install a retina update that come out via an IAVA.  It is fairly simple and below is the way to get it done.

To install the update, please double-click the RetinaUpdateIAV executable file. Click
Next/Yes/Next/Finish as pictured below.
When you install the “Retina IAVA Audit Updates” you will receive 4 sets of windows and as stated above just select the defaults. The install package puts the latest IAV updates into your eEye product.

I really do not like retina as a vulnerability scanner as there are some many nicer and easier to use ones currently on the market, but retina has been out for many years and they have large contracts with the government so that is the one we have to use.