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Autodesk trials offer the chance to explore full capabilities of the latest software for a limited term (typically 30 days). To cancel a free trial, turn off automatic renewal before the trial period ends. If a payment method was not required at the start of the trial, it'll expire automatically. 

If your trial expires, you cannot extend the trial period. For short-term needs, you can purchase a monthly subscription and turn off automatic renewal (to limit the length of the paid subscription to one month only) or purchase Flex tokens for a flexible pay-as-you-go plan.