Then, the error "E_ACT_TOO_MANY_ACTIVATIONS" occurs, indicating that all of the authorizations allowed for Adobe Digital Editions on that machine have been used.
In some cases, you don't receive the error, but run out of activations after switching machines or replacing hardware.
Use the following workaround to allow your machine to launch Adobe Digital Editions 4.0. If you received the error "E_ACT_TOO_MANY_ACTIVATIONS or Adobe Activation Request Error 2004," contact us to have the activation count reset.
If possible, generate a System info file before you contact us (see instructions below). Adobe uses this file to help find a common element that's causing this issue for all Adobe Digital Editions users.
Note: It is helpful to note (in your case submission) the brand of your machine, plus any spyware, malware, or security tools that are installed. For example, if you have any McAfee products installed, or spyware tools such as Lavasoft's Ad-aware.
E_ACT_TOO_MANY_ACTIVATIONS, Error 2004, Adobe Digital Editions; kb405200