Install and update

Download Tradeline, upload it to your store and move your settings to a new version.

Tradeline is sold directly by Veloso Labs, so Shopify's one-click theme updates don't apply. Each version is a zip you upload next to your current theme. Your live store keeps running the old version until you publish the new one.

Install

Download Tradeline: the free Lite package from the Tradeline page, or, with a Full licence, from your licence page once your store is on the licence. Lite and Full are the same package.
In Shopify admin open Online Store › Themes, choose Add theme › Upload zip file and pick the zip. The theme is added to your theme library, unpublished.
Choose Customize. With a Full licence, paste your code under Theme settings › Licence (see Tradeline Lite and Full). Pick a style and industry kit, set your logo, colours and menus, then publish.

Update to a new version

Read What’s new to see what changed.
Download the new version and upload it as above. It arrives unpublished, next to your current theme.
Bring your settings across. Shopify doesn't copy settings between uploaded themes. In your current theme choose ⋯ › Edit code and copy the contents of config/settings_data.json, the page templates you changed in templates/ (the .json files) and sections/header-group.json and sections/footer-group.json. Paste each into the same file in the new version and save. Settings the new version adds start at their defaults.
Check the licence code is still there (it is part of settings_data.json; a code saved as a velosolabs_licence metaobject carries over on its own).
Choose Preview and check your homepage, a collection, a product and the cart on desktop and mobile.
Publish the new version. Keep the old one in your theme library for a while so you can switch back.

If you'd rather not do this yourself, ask us and we'll move your settings across.