System requirements

Browser	Latest versions of Chrome, Safari, Firefox and Edge
Confluence	LTS 6.6.x, LTS 6.13.x or LTS 7.4.x - applies to both Server and DataCenter editions of Confluence
Acrolinx	Acrolinx Server 2018.12 and later and latest version of Acrolinx Cloud
Scroll Versions ¹	latest
Scroll Translations ¹	latest

¹ optional

Additional Information for your Acrolinx installation

Guidance profiles (formerly called Checking profiles) on the Acrolinx server must not be removed if they are still referenced in Confluence
The profiles must be visible to all Confluence users that are supposed to use the Acrolinx Connector (by default Acrolinx does not limit profile visibility)
"Scorecard Access" must be set to "limited" or "public" on Acrolinx server. See "Users" -> "Privacy"

If you fulfil the system requirements, you can move on and install Acrolinx Connector on your Confluence instance.