Sorry about the links, I must've had an Operator Headgap Error. I use a Windows pc, and here's the steps I use to create a new Stratux microSD card:
Download the .zip file. "Unzip" the .zip file, and copy the .img file that's inside it to your desktop. It's a pretty large file.
Use Win32DiskImager to write the .img file to the microSD card. Win32DiskImager is a free utility you can download from Filehippo.com or various other sites. Just be very careful that you are writing the image to the microSD card and not somewhere else, as you will lose anything that currently exists on the target drive.
When the image is written, and it takes several minutes, you can pop the microSD card into the Stratux Pi and power it up. At that point you have a fully functional Stratux.
Now that your Stratux is alive, it's easy to upgrade using only your tablet when new versions come out. Simply download the new .sh file onto your tablet (I use an Android), connect to your Stratux, and use a web browser (I use Chrome) to point to the Stratux webpage at 192.168.10.1. Find the Settings page, and tap the "Click to select System Update file". Then navigate to the update file on your tablet. When it's selected, tap the same box on the Stratux webpage to start the update process. Within a minute or so, you'll be updated.
The second link should've been updates.stratux.me/builds/