The IP of the main update / replica server for autoinstall.plesk.com is 126.96.36.199
- /usr/local/psa/admin/sbin/autoinstaller --source=http://188.8.131.52
Parallels uses a content distribution network (CDN) to distribute Parallels Plesk Panel packages. This technology uses several cache servers which are distributed across different parts of the Internet. All of the servers share a common domain name, autoinstall.plesk.com, which resolves into different IP addresses, depending on the network segment that a request comes from. Sometimes, one or another server gets out of sync with the main replica and one or a few of its files may go missing.
Use the main replica of the Parallels Plesk Panel repository until your local CDN server gets in sync with it. To do this, configure the static resolution rule in the file /etc/hosts or specify the IP in the --source option to autoinstaller