SharePoint 2019 does not require a separate, manual download of Windows Server AppFabric. It uses the AppFabric 1.1 for Windows Server binaries, but they are included either in the SharePoint prerequisites installer or via the Distributed Cache service role. The standalone AppFabric download is typically only needed for older versions (SharePoint 2013).
SharePoint 2019 includes AppFabric dependencies within its own prerequisite installer. Attempting to manually install the standalone "WindowsServerAppFabricSetup_x64.exe" (version 1.1) may cause the SharePoint 2019 Distributed Cache service to fail. windows server appfabric download for sharepoint 2019
Below is content that explains this clearly to prevent errors. Title: Does SharePoint Server 2019 Require a Separate Windows Server AppFabric Download? SharePoint 2019 does not require a separate, manual
Unlike SharePoint 2013, SharePoint Server 2019 does not require you to manually download and install WindowsServerAppFabricSetup_x64.exe . The AppFabric 1.1 components are now an integrated part of the SharePoint prerequisite installer. Title: Does SharePoint Server 2019 Require a Separate