Windows has built-in "Loudness Equalization" in the Sound Control Panel that can provide a basic boost.
Searching for "serial numbers" or "cracks" for older software versions like DFX 12.023 is highly discouraged for several reasons: dfx audio enhancer 12023 serial number new new
Restores the high-frequency harmonics lost during the encoding process. Windows has built-in "Loudness Equalization" in the Sound