[Orgmode] how to upgrade org-mode version?

[Kristofer Bergstrom]

I would like to upgrade my version of org-mode (I'm using Emacs23),
with the hopes it will solve a problem of the :tags option not being
evaluated in clocktable dynamic blocks.  According to "M-x
org-version", I am currently using 6.21b.  Matt pointed me to
http://orgmode.org/org-6.36c.tar.gz .

Is there information available about how to upgrade, or install
multiple versions of org-mode?  The "Installation" instructions in the
org-mode manual refer to Emacs22 or to enabling the pre-installed
Emacs23 version.

Thank you in advance!

Kris Bergstrom
Los Angeles CA