If you already have an existing Apsona installation in your cart, tied to an Apsona account, you should only need to download and install the update from our downloads area. If you don't have one, though, you can sign up for one, in which case you should get a package containing all the files you need, including the ones for Zen Cart 1.5.

If you are seeing any anomalies, please let us know and we'll fix it.

Thanks!