Microsoft Supported & Community Downloads for IIS...
Microsoft downloads are fully supported with future updates, bug fixes and customer support. Community downloads are submitted by IIS community members and do not benefit from Microsoft approval or support, and should be downloaded with this in mind.
IIS Compression is a collection of compression scheme providers that add support for Brotli compression and provide a better implementation of Gzip and Deflate compression than those that ship with IIS.
This Compression Scheme Plugin exposes Google's Brotli encoding library to the IIS built-in Static and Dynamic Compression Modules. This plugin requires no additional licensing and is free for all users.