I maintain 2 identical sites- both have same version of X, PHP, WP, plugins, etc…
None of my pages I created templates from have errant HTML or Classic theme elements.
Downloaded the templates to use in the second site and about 65% upload it just stops and shows error “improperly formatted”. Did it on a page that had current elements and no css, errant html or anyting special. => ERROR
Cleared all Cache, switched to another browser , tried a different network => ERROR
Did not have this issue in version 6.x of X theme- now in the 7x ver. it’s just annoying.
I purchased X themes so I would not have to recreate pages - and save some time- but this is just ridiculous.