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Download Plugin Update API

There are two ways to download the plugin version programmatically:

Download the latest plugin update compatible with a certain product

https://plugins.jetbrains.com/pluginManager?action=download&id=<pluginXmlId>&build=<productCode>-<buildNumber>

Where

pluginXmlId is specified as a Plugin XML ID parameter on the right of the plugin's individual update page and in the plugin.xml;
productCode is a two-character product code. Can be blank.
buildNumber is a build number of the IDE (specified in the About Dialog in the product, and in the release notes).

e.g. for Scala plugin (pluginXmlId=org.intellij.scala) & IntelliJ IDEA 2017.1 (productCode=IU, buildNumber=171.3780.107):

Download a specified version of the plugin

https://plugins.jetbrains.com/plugin/download?pluginId=<pluginXmlId>&version=<version>

Where

pluginXmlId is specified as a Plugin XML ID parameter on the right of the plugin's individual update page and in the plugin.xml;
version is a version of the plugin update.

e.g. for Scala plugin (pluginXmlId=org.intellij.scala) & Version 2017.1.15: