Extracting file from MSI package

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Hi,
I'm trying to crack (or keygen) a software where the serial is validated at setup time. I've unpacked the MSI content using the "msiexec /a /pb" command line switches or using lessmsi utility. However, the file used to validate the serial number is missing.
I've looked with ORCA and I've found that it uses CustomAction (_serial_verifyCA_isx and _serial_verifyCA_isx_helper). The property SERIALNUMVALDLL is set to <ISProjectFolder>\dlls\serialnumber3\debug\ValidateSN.dll

Does anyone have an idea on how to extract the "ValidateSN.dll" ?

(I didn't find the file in the temp folder and I've tried to dump the msiexec memory with no luck so far).

Thank you.