The following bug has been logged online:

Bug reference: 2745
Logged by:
Email address: tsangwingkein (AT) gmail (DOT) com
PostgreSQL version: 8.2 beta
Operating system: windows xp
Description: upgrade.bat refers to msi file name for version 8.1 ms
Details:

The last line should be

msiexec /i postgresql-8.2beta2-int.msi REINSTALLMODE=vamus REINSTALL=ALL
/qr

or you can set a variable called say POSTGRES
with POSTGRES having value of the msi file name. then
msiexec just use that variable.

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