When I went to the link in their email, there is a notice about their server being swamped. It did download successfully albeit pretty slowly for my cable connection. At the end of the install, this pops up:
<hr>What's new in PerfectDisk build 7.00.046
* We added support for the X64 processor. You cannot patch a 32 bit version of PerfectDisk to a 64 bit version due to limitations of Windows Installer. You will have to get a 64 bit installation of PerfectDisk in order to run on the X64 bit operating system. Please contact Raxco if you need assistance in getting a 64 bit version to install.
* Corrected a bug in the boot time defragmentation. If you exceeded 268,435,456 clusters, the verify stage of the boot-time defrag pass would fail.
* Corrected a bug on the enable/disable menu for Group Policy Schedules. The local User Interface (UI) should not be permitted to change the current status of a Group Policy schedule, however under certain conditions, the local UI could disable a Group Policy Schedule. This has been corrected.
* PerfectDisk Support Info feature will now gather additional information to assist in troubleshooting any issues. <hr>