<para>

It is recommended that most users download the binary distribution for

Windows, available as aone-click installer package

Windows, available as agraphical installer package

from the <productname>PostgreSQL</productname> website. Building from source

is only intended for people developing <productname>PostgreSQL</productname>

or extensions.

<para>

If you are using a version-specific installation directory, e.g.

<filename>/opt/PostgreSQL/9.1</>, you do not need to move the old cluster. The

one-click installers all use version-specific installation directories.

graphical installers all use version-specific installation directories.

</para>

<para>

<para>

For Windows users, note that due to different integer datetimes settings

used by theone-click installer and the MSI installer, it is only

possible to upgrade from version 8.3 of theone-click distribution to

version 8.4 or later of theone-click distribution. It is not

possible to upgrade from the MSI installer to theone-click installer.

used by thegraphical installer and the MSI installer, it is only

possible to upgrade from version 8.3 of theinstaller distribution to

version 8.4 or later of theinstaller distribution. It is not

possible to upgrade from the MSI installer to thenew graphical installer.

</para>

</refsect2>