1. computer is already authorized.
2. Adobe Digital Editions prompted to update, however, the updates would not install.
3, received "Error! check activation" message in response to attempts to open Adobe Digital Editions.
4. uninstalled and reinstalled Adobe Digital Editions to current version 4.5.1.139278.
5, previously downloaded .acsm files eBooks were populated onto new install along with authorization information.
6. same error message received "Error! check activation", however now in response to attempts to open .acsm files eBooks.