This is extracted from the DacEasy page:
Sage DacEasy will continue to support its customers on Sage Business Care and no new release is planned at this time. If you wish to go to a more current product, see what the migration process looks like and get the answers to many of the questions you may have, visit our Sage DacEasy Migration Resource Center. Contact Sage DacEasy at 800-937-9951 with any questions you have on your current product. Sage DacEasy no longer sells new software licenses.
As you can see in the paragraph above, you can't purchase or install DacEasy anymore since I believe it has been retired. You should look for other Sage products since they might have incorporated DacEasy's functionality.