what theme is this

It’s a custom theme. It’s not clear if it’s a “roll your own” or based on another theme.

Free themes here: https://www.ads-software.com/themes/

I don’t recommend downloading themes from any other site unless you know who operates the site.

Looks like a custom theme. You can look for themes here:
https://www.ads-software.com/themes/

The filter/tag search may help narrow down your results.

EDIT – cross-posted with Kurt :)!

May be, They remove theme information after activation.