If you use the Install Manager, you can access the Read Me's there. You will see a small icon 
just to the right of the product installer. Clicking this icon will open the Read Me in the browser.
You can also look up Read Me's in the doc center here: http://docs.daz3d.com/doku.php/public/read_me/index/start
The best way to use this is to get the SKU number from the product page, just to the right of the description, then click on the number range in this index and look up the product by name.
Older products (generation 3 and 4) may not have an updated Read Me yet. If it is not available in the doc center, you may find one in the installed files of the product in the Read Mes folder.