I'm going to follow the release notes. Not use the patch.
3.1. Before Upgrade
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We strongly recommend the following measures for decreasing the IIS load and
eliminating the possibility of file locking during the backup/restore procedures:
* Do not login to the Plesk Control Panel and do not make any actions in it.
* By means of firewall, prevent the possibility of external access to the
Plesk Control Panel, server's files, sites, and their mailboxes.
* Stop and disable Indexing Service if you use it.
* Stop and disable Windows Media Services if you use it.
3.2. Upgrade Steps
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1. Log in as "Administrator" or another user with Administrator's privileges.
2. Change your working directory to the directory where the Plesk 7.5 for Windows
distribution resides.
3. Run the installer.
4. Follow the on-screen instructions.
5. When the backup and uninstallation phases are finished, reboot confirmation will be requested.
6. After reboot Plesk will have started for installation and restore phases automatically.
3.3. Completing Upgrade
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There are no additional actions, Plesk is ready to use.