Where to install it
TreStack Timer is listed on the Shopify App Store at apps.shopify.com/trestack-timer. Install it from there, logged into the store you want it on. There is no other install route.
What an install changes
TreStack Timer is a Shopify theme app extension. Installing it registers the app and its extension on your store. It does not open your theme files, it does not add a snippet to your layout, and it does not register a script tag. The app never asks you to paste code into your theme.
Until you publish a timer and turn on the app embed, the storefront renders exactly as it did before. Even with the embed on, the embed prints nothing at all, not even its script, while no timer is published. That makes an install safe on a live theme.
The four access scopes, and why each one is there
read_products lets the app list your products and collections, so you can choose which ones a timer shows on. read_themes lets it check whether the app embed is turned on in your live theme, which is what the status on the app Home reads. write_files lets it upload a timer background image to your own store Files. read_locales lets it read your store languages, so you can write timer text for each one.
That is the whole list. The app has no access to orders, customers, or payments. If the permission screen shows anything beyond these four, stop and write to [email protected] before accepting it.
Where things live afterwards
Almost everything happens inside the app in your Shopify admin: the Home page with a setup guide, the list of timers, the editor with its live preview, analytics, and plans. The setup guide works its steps out from the real state of your store, such as whether the embed is on and whether a timer is published, so it never asks you to tick a box by hand.
The theme editor holds two things only: the app embed switch, and the app block for timers you want in a custom position. Live chat with the people who build the app sits inside the app admin.