One of these things can delay an install:
1. Something blocking game files from installing - firewall, anti-virus, or User Account Controls. Find out which one or disable them all temporarily during install process.
2. Something got corrupted during download process. Re-download the game and maybe try from a different source (website, Ignite, or mirror) and be sure nothing blocks the game files from downloading like #1. Before re-download, be sure to delete the old installer file located in default C:/AeriaGames/Downloader
Also, not having an anti-virus is almost as bad as having an anti-virus block programs from working. There could be all kinds of unwanted programs on your computer that could be blocking files from working properly. If you fall into this category, I highly recommend fixing that before doing anything else to try and fix the game. Some free software includes AVG, Avast, and MalwareBytes (I personally use AVG, MB, and Spybot).