For installation and configuration steps see here.
Instructions for customizing the web part layout are here.
If you are bilingual and can do translations for the FBA Pack, any help is greatly appreciated! All files that need to be translated are found in SharePoint2016-2019FBAPack.ResourceFiles.1.3.6.zip. Instructions are here.
1.3.6
Fixed issue 14 (SharePoint 2013) - Slow Manage Users page with 1000's of users