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Various Plesk operations fail: error setting certificate verify locations: CApath: none

An error like these appears in the extensions catalog, backup scheduler, during Plesk updates, or while running the Daily Maintenance task
error setting certificate verify locations: CAfile: C:Program Files (x86)Pleskadminconfcacert.pem CApath: none
external server error
Installing WordPress using the Applications menu fails
Error: The following error has occurred during the download of application:
HTTP Error (0) https://cdn.apscatalog.plesk.com/all-app/WordPress.org/WordPress/5.2.1-273.aps?packager=Plesk
Sharing Violation

The CA certificate, cacert.pem, is corrupted or missing, which prevents connections from being established.

Download and install the missing file.

Windows

Linux

Connect to the server over RDP
Download cacert.pem from the cURL website: http://curl.haxx.se/ca/cacert.pem
Place the file inside %plesk_dir%adminconf.
Make sure that these directives in %plesk_dir%adminconfphp.ini have the right path to cacert.pem
curl.cainfo="C:Program Files (x86)Pleskadminconfcacert.pem"
openssl.cafile="C:Program Files (x86)Pleskadminconfcacert.pem"

Connect to the server over SSH
Run this command to download and install the CA certificate from the official cURL website
# wget https://curl.haxx.se/ca/cacert.pem && mv cacert.pem /etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem

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