click the words Archive of versions there are 3
I would recommend the newest version
To play a .part file first open sView then click media open movie > from one file > this will open a file location window > now in the bottom right It will say all supported in a drop down menu Just above the OPEN CANCEL buttons change that from all supported to > any file ( * ) now the .part will show up click on it and click open sView will start playing the file.
The aspect Ratio is under View>Display Ratio set it to 16:9 then set it to keep on restart.
If you don't see this option then open a file/movie then go to full screen and look for it in the same location.
Like I said I can use my scroll wheel on my mouse I can also use the (+ -) plus minus keys on my keyboard to change the zoom/aspect ratio.
I had this already typed up so it may help others I will leave it posted. You prolly missed the selection on the install for the shortcut ? I don't let any program make short cuts so I unchecked them all, but they prolly was a check for making one ?
Glad you got it sorted/working