I have a Toshiba Tecra, Model number PTA42U-015-003

I am attempting to update the BIOS for this laptop so that I can
enhance overall system performance.

http://www.csd.toshiba.com/cgi-bin/tais/su/su_sc_dtlViewDL.jsp?soid=1307457&moid=882431&rpn=PTA40U&BV_SessionID=@@@@2027989460.1208388174@@@@&BV_EngineID=cccdadedlfgkkgicgfkceghdgngdgmm.0&ct=DL&all_docs=false

I see the following:
ACPI Flash BIOS version 2.00 for Tecra A4 / Satellite M40 (Intel
video)

After unzipping the archive, I choose "Install from Windows" option,
but see the following popup:

Error:
        BIOS Package Cannot Use on This Platform

Just want to make sure that I am referring to the correct BIOS version
and any directions or assistance is greatly appreciated.

Thanks in advance.