CO2, Irfanview on Windows 10 App store, and my first flash animation

This was my first flash - SWF - animation (I also use Irfanview on it). This animation wasn't working no more in my site because of a plugin problem. So, I need to convert it to gif.

I couldn't find any good SWF to Gif converter on Windows 10 App Store. But, to my surprise, this sensational program called Irfanview is now on the store. It's a surprise because that store is almost useless! For example, I couldn't find any gif maker that work properly. Nothing, even a simple gif maker!

But now, at least, there is Irfanview free on Windows 10 store.

I am not a native English speaker, so - if you are a English speaker - you can help me. Feel free to point my erros.