You’ll have to extract the .zip file to a folder and run the executable, then connect your camera to your computer with the USB cable that came with it. Here’s a video tutorial. (You can mute the sound, there’s no voiceover)
Another way that works for many cameras is this website: https://www.camerashuttercount.com/
or this website: http://shuttercounter.com/
You can upload an unedited photo, and it will tell you how many shutter releases the camera has had. If you have a slow connection like me and don’t want to wait forever to upload a raw file you can change your settings for one picture to the smallest image quality. It looks like my shutter count is at 37849.
Those numbers aren’t necessarily anything to worry about. It’s just like the miles on a car. We tend to think of 200,000 miles as about the limit for a car nowadays, but there are lots of cars that go way over that. I know of a minivan that has nearly 300,000 right now, and it’s still running strong!
If your camera is still working fine, don’t worry about the number of shutter actuations. You might want to keep an eye out for good deals, certainly, and upgrade if there’s a compelling deal, but don’t upgrade merely because the “mileage” is high. I’ve never had a camera long enough to find out what happens at 100,000 clicks, but I don’t think it will explode or anything. 🙂