Built on SQSP 7.1 Classic Editor
Templates are built on Squarespace 7.1 with Classic Editor, with a few Fluid Engine sections sprinkled in. You're free to add new FE sections, but support will not be provided when altering original sections from CE → FE.
Business Subscription Only
Business Hosting Subscription is required for all template features to work properly. SM Templates use Custom Code to be able to function properly — if you see styles suddenly change after upgrading, you picked the wrong plan.
Cannot apply to existing sites
Templates are standalone websites, so it's impossible to add to an existing site. You’ll have to build out the new site from scratch, copying over content from a previous site to the new template site, and re-adding the domain + hosting.