Due to Realtek moving HDXRT.inf and HDXRTSST.inf hashes from hdxrt.cat to hdxrtu.cat in 6.0.8825.1 and the absence of a hdxrtu.cat copy for current version, it wasn't possible to make a Realtek UAD Generic package for old systems that is 100% WHQL compliant. To workaround this setup installs latest WHQL compliant codec component (version 6.0.8856.1) with hardware support application, audio effects and service components taken from latest version and then a force updater is used to replace the old codec component (RTKVHD64.sys and RTAIODAT.DAT) with its latest version.
The open-source setup gained the ability to remove OEM specific Realtek UAD components specified in a config file - oem.ini. It expects names of INF files with or without extension each on its own line.