BUG #2630: Can't unpack

The following bug has been logged online:

Bug reference:      2630
Logged by:          Alan Escreet
Email address:      leet3lite@gmail.com
PostgreSQL version: 8.1.4
Operating system:   Windows
Description:        Can't unpack
Details:

I am unable to unpack the database from the tar.gz file. I have tried all
the suggested packages to do so from the gzip website, but they were all
unsuccessful. I have checked the downloaded file's md5 checksum and it is
ok. Is there an error in the tar.gz file?
Is there a differently packaged PostgreSQL that I can try (i.e. a zip file)?
It has taken me 3 hours so far trying to get the database out of the box
with no success...