1. Log in to your Streamline web app and click "Account>My Account".

2. Then, go to 'Plans and Billing' page. Then, click "Cancel Plan".

3. On this page, click "Cancel Subscription".

Note : After canceling your plan, you can still use all the premium features until the end of your current billing cycle.
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As a reminder, you still have a lifetime license for assets already embedded in your projects forever. The ones you downloaded but you haven't used are not included.