Because 3.1.0.0 is an older build, it may struggle with User Account Control (UAC) permissions on modern Windows. You may need to run it in "Compatibility Mode" (specifically for Windows 7 or XP) just to get the installer to unpack correctly.
C:\Users\Leo\Memories\first_dog.wmv → C:\Users\Leo\Memories\first_dog.gone
While version 3.1.0.0 was a stable release, a later version (3.2) was released in 2014 before development seemingly ceased.
While Koyote Soft has largely moved on to newer versions (like 3.2), version 3.1.0.0 is still hosted on several reputable software archives.
Version 3.1.0.0 predates modern compression standards. If you try to convert a video recorded on a modern iPhone or Android device, Koyote will likely crash or fail to read the file. It simply does not recognize the encoding used in modern H.265 or VP9 videos.