Installing Plesk 18.0.59 or updating to this version fails

Symptoms

• An attempt to install or update to Plesk Obsidian 18.0.59 is performed on a Linux-based operating system
• The Plesk installer output shows errors that are similar to the following:
  RHEL-based systems:
  

  CONFIG_TEXT: Download Extra Packages for Enterprise Linux 8 - x86_64 34368B [total 0/unknown B 1/1 files]
  Failed to install {'name': 'plesk-php81-pear', 'arch': 'noarch', 'version': '1.10.13', 'release': '0redhat.8.231228.1347'}:
  Error while downloading packages metainfo: No match for argument: plesk-php81-pear-1.10.13-0redhat.8.231228.1347.noarch. Trying again.
  Failed to install {'name': 'plesk-php81-pear', 'arch': 'noarch', 'version': '1.10.13', 'release': '0redhat.8.231228.1347'}:
  Error while downloading packages metainfo: No match for argument: plesk-php81-pear-1.10.13-0redhat.8.231228.1347.noarch. Trying again.
  Failed to install {'name': 'plesk-php81-pear', 'arch': 'noarch', 'version': '1.10.13', 'release': '0redhat.8.231228.1347'}:
  Number of retries is exceeded.
  dnf.exceptions.PackageNotFoundError: No match for argument: plesk-php81-pear-1.10.13-0redhat.8.231228.1347.noarch

  Debian-based systems:

  CONFIG_TEXT: Execution failed with exit code 1.
  stdout:
  ERROR: The required version '3.58.0' was not found on the server.
  This could happen because of configuration error at the installation source.
  The MD5 checksum of the /var/cache/parallels_installer/parallels_installer_Ubuntu_18.04_x86_64_3.58.0.tmp file does not match the value specified in the configuration file. Expected: 213480b0b2c459c964a9e98e36199816, actual: 743e2c6f9e4e07952ad4f69f3c11791a.
  Not all packages were installed.
  Please resolve this issue and try to install the packages again.
  Visit https://support.plesk.com/ to search for a solution.

  CONFIG_TEXT: Err:19 http://autoinstall.plesk.com/PHP81_17 focal/all amd64 Packages
  File has unexpected size (9083 != 9064). Mirror sync in progress? [IP: 203.0.113.2 80]
  Hashes of expected file:
  - Filesize:9064 [weak]
  - SHA512:e982d58f0f73fd8fe86895ef66a56dab50db07042514a647f4e92470e3f6c196fcca8f4f1b0506e22154e9db9dd7f527a9864de2580659ded3afcab4c6909848
  - SHA256:029a0a146e7761c754c6985222ef7a9577c7d39fc6aa74fd17c73ae2efce022e
  - SHA1:e7293c458d3ae9977b4bb071761f8055c9b7d158 [weak]
  - MD5Sum:c080b2aa10e220a93dc6d7c95174ef0d [weak]
  Release file created at: Tue, 02 Jan 2024 07:46:50 +0000
  Fetched 3885 B in 1s (2917 B/s)
  Reading package lists...
  E: Failed to fetch http://autoinstall.plesk.com/PHP81_17/dists/focal/all/binary-amd64/Packages.bz2 File has unexpected size (9083 != 9064). Mirror sync in progress? [IP: 203.0.113.2 80]
  Hashes of expected file:
  - Filesize:9064 [weak]
  - SHA512:e982d58f0f73fd8fe86895ef66a56dab50db07042514a647f4e92470e3f6c196fcca8f4f1b0506e22154e9db9dd7f527a9864de2580659ded3afcab4c6909848
  - SHA256:029a0a146e7761c754c6985222ef7a9577c7d39fc6aa74fd17c73ae2efce022e
  - SHA1:e7293c458d3ae9977b4bb071761f8055c9b7d158 [weak]
  - MD5Sum:c080b2aa10e220a93dc6d7c95174ef0d [weak]
  Release file created at: Tue, 02 Jan 2024 07:46:50 +0000
  E: Some index files failed to download. They have been ignored, or old ones used instead.
  Warning: there are errors in 'apt-get update'
  Detecting installed product components.

Cause

On 21 Feb 2024, issues with the official Plesk CDN were preventing the files tied to the new Plesk version (18.0.59) from being served properly.

Resolution

The general issue with the Plesk CDN was resolved on the day during which it occurred, however due to the specifics of CDN functionality, some Plesk servers may still remain unable to fetch the correct files from the Plesk CDN for up to 48 hours after the issue was resolved.

If you are still unable your Plesk server to 18.0.59 a week after the CDN issues were first encountered, you should try executing the following workaround:

1. Log into your server via SSH as the root user
2. Start the Plesk installer CLI interface with manual version selection by executing the following command:

# plesk installer --all-versions

3. Follow the instructions and select version 18.0.59 manually

4. Start the installation or update

If the installation or update cannot finish for any reason, please submit a Technical Support request by following this link:

Submit a request – Plesk