Downloading Theme with Shopify CLI

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Hi.

I am new to Shopify. I want to customize an OS 2.0 theme with both (a) theme editor for non-developer and (b) Shopify CLI for developers.

However, my trial themes are not listed from the command:

shopify theme list store=[store_name]

I receive error when I pull the theme:

% shopify theme pull --store=[store_name] --theme=[theme_id]

-- errors --
23:08:21 ERROR  » get assets/blank.svg: ✗ Invalid password. Please check that it was generated from Theme Access app for the current store.

Do I must pay theme first for license reason?

Once I purchase a theme, will my team (both developer and non-developer) edit the theme? If yes, any tips on version control for parallel customization?