Here’s what should happen. If you click on the photo, it should prompt you like so:
Your filename may be different than the one above, depending on which slideshow you’re attempting to view.
You can click:
After choosing “Run” or “Save”, while the file is downloading, it should look something like the picture above. The download should take about 1 or 2 minutes, depending on the speed of your internet connection.
If you chose “Save”, when the download is complete, you will see the screen above. Click on “Run” to continue.
The “publisher could not be verified” is just a scam by MicroSoft to make money. You would have to pay them jillions of dollars to get a valid digital signature and register yourself as a publisher. (Or maybe not, but it’s more than I can deal with at this point). Just click “Run”.
It should then automatically launch a little slideshow in a window like the one shown above.