davidbrook on "Problems with updated Invert Lite theme"

Just updated to the new Invert Lite theme which caused issues to the site:
http://mmonuments.com.au/ I have no backup and cant see a way to revert to the older theme.
Why create an update which is going to cause issues?
Im using WordPress 4.5.3.

you can fild old versions here:
https://themes.svn.wordpress.org/invert-lite/