Need help with my website

I downloaded Box Theme and I’m having difficulty getting this theme to work properly. I’m using wordpress made many changes to customize it, and yet it still not working as I want. I’m very limited to coding, I use mostly what I can find in the forums and internet.

Would someone who is a developer be so kind as to help me out with these following issues:

I received an email stating that I need to download the update. I have no idea how to do that. When I tried to download the theme again, it just told me it cant because theme already exits.

The slider revolunary slider does not work, I have no idea what is this used for.

You can follow the update wordpress theme with my video for your case, it will similar.

I hope you made a child theme before making changes, else they’ll be lost when you update the theme.