You can lease a Digital Adapter from Time Warner Cable.
In some locations where TWC is transitioning to an all-digital TV signal, Digital Adapters may be free of charge to existing customers for an extended time period, based on the equipment and services they have today, and to eligible existing customers who receive Medicaid. After the free period ends, each Digital Adapter will be charged monthly at the prevailing retail rate. New customers will be charged at the prevailing retail rate; the free period does not apply to new customers. See our Digital Adapter support page for details.
Note: In Texas and the Midwest, this information applies only to customers in Austin, Dallas, San Antonio and Kansas City.