Create a new child theme based on a template in site library

I installed GeneratePress.

Then I installed the child theme.

Then I installed GP Premium.

Then I installed GenerateBlocks.

Then I choose Mike Oliver's 'Service" from Site Library.

I made big changes and now I'd like to send the modified theme to a friend of mine, so he can have the same site and change only some picture.

I'd like to give him a zip to install.

Is it possibile?

Thanks.