What concerns me if that according to the item's comments, you only asked the question 21 hours ago, and the author last commented on an item (not yours) 1 day ago. If you started this topic 12 hours ago, that means you only waited 9 hours!
It's clear that he is active, but please don't forget that this marketplace is worldwide (author may be sleeping whilst you are awake) and also that we are all human. Being that it's a Monday, the author may have had other priorities to sort out before getting to yourself. I know it's not nice to not hear from someone when you need help, but please don't publicly bash an author via the item comments or forums because they didn't reply within 9 hours. Just give them time and be patient.
Now, as other members have said. What in particular are you having difficulties with in regards to installing. Here are a few questions to help you out:
- What have you tried so far, did you see any error messages?
- Have you setup the database?
- Were you given any SQL to run, have you run this?
- Is there a configuration file at all (usually config.php)
- Have you entered the host, username, password and database name into a config file?
According to the item's description, it states: "Quick and easy installation. All you have to do is access one page and provide log-in information for an administrator" so it looks as though all you need to do is set up an empty database, upload the files, and access the URL, and an installer will take you through the rest.