If you read through the thread you will find instructions for using this program to scan from your printer. Here is the short version.
Use your file manager to locate the Peasyscan configuration sample file name config-sample.cfg. It will be found in /usr/local/peasyscan. Copy the file to the "config" folder found in the same location.
Rename your sample file to something like 3050A.cfg. Open the file with a text editor.
The other method for scanning from this printer is to place the device uri in the address bar of my default browser like this:
http://192.168.1.78 (substitute the uri for your printer). You should see a page in your browser that looks just like the screen shot at the bottom of this post. You will be able select the "scan" function from that page.