Mosaic - Installing a demo and upgrading to the full version
You can grab a demo copy of the theme here:
The next step is to upload the zip file to your store:
After testing it out you can purchase a copy and preserve all of your customisations: copy over the full version assets > theme.js, snippets > layout__cart-modal.liquid and templates > cart.liquid to your demo version and you'll be good to go.
* For the step above, it's important that the demo version is the same as the purchased copy. If it's different and you don't want to upgrade your entire theme, just message us and we can send you the files: http://support.troopthemes.com/contact
You can find the theme version by clicking the Info link in the top right of your theme settings.