We Offer free theme installation in New Big Commerce stores within 7 days of purchase of the theme. If you have an old Big Commerce store and want to install a new theme,you need to have a development partner, who can integrate the theme in your store.
You need to either hire our developers or discuss with your own development partners while installing the theme in your previously launched Big Commerce store.
The themes are created and tested to run smoothly with Stencil engine and hence there should be no issues while installing if the theme is installed as per Big Commerce guidelines
Stencil Theme Support