previous versions dreamweaver

To clarify, you either purchased a 1 year plan or a monthly plan which auto renews each month until you cancel.   Trial members have 7 days to evaluate the software for free. You have 14 days to cancel & request a refund.

How do I Cancel my Subscription?
https://helpx.adobe.com/manage-account/using/cancel-subscription.html
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Subscription & Cancellation Terms:
https://www.adobe.com/legal/subscription-terms.html

CONTACT ADOBE SUPPORT:
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Online Chat: https://helpx.adobe.com/contact.html?rghtup=autoOpen
Phone M-F, during normal business hours: https://helpx.adobe.com/contact/phone.html

To use Creative Cloud, you need a min of Mojave or higher. Adobe expects users to have the latest OS, no more than 2 versions back.  For this reason, pre-2020 versions are not offered through the CC Desktop App.

Please ensure your computer meets or exceeds the minimum system requirements to run Creative Cloud + OS + all other apps you use. Check each one.
- https://helpx.adobe.com/creative-cloud/system-requirements.html
- https://helpx.adobe.com/dreamweaver/system-requirements.html

If you click on the All Apps button in the CC App you can view the apps in a list.  Then click on the 3 dots for the menu next to Install and there you will see the option for Older Versions and you can install the previous version which is compatible with your OS.