Resolution
This article describes how to install Plesk hotfixes that are provided in KB articles. Please familiarize yourself with the article carefully.To install a Plesk hotfix that has been provided in KB article the following steps need to be completed:
1. Download the file to the server in binary format. Save it in any folder but not in the destination one.
2. Backup or rename the original file.
3. Important: Copy the saved file to the destination location. It is important that file inherits correct ACL permissions from the parent folder otherwise Plesk will not be able to access the file, displaying the following error message:
Warning: failed to open stream: No such file or directory