from http://www.mambodocman.com/index.php?option=content&task=view&id=36&Itemid=2

"Upgrading to RC 2 and translations

Friday, 30 September 2005

After a new release a common question is 'how do I upgrade DOCMan'. At the moment Mambo or Joomla don'tt support component upgrades. This will hopefully change in the future. Until then u need to upgrade DOCMan manually, the best way todo so is a simple 3 step process.

Backup your whole database
Uninstall the current DOCMan version
Install the new DOCMan version
Restore your database backup"

- warning: when I went through the process above I first found the restore wouldn't work with the original database in place. Once I had deleted the existing database I discovered I was unable to restore from backup because some of the field names used were reserved words in SQL. If you know how to do it I would recommend leaving the original database in place and just repopulating the docman tables in it after the upgrade, then see note about errors after upgrade below -


Latest release (at 10/11/06) is 1.3 RC2

Useful modules for 1.3 RC2 only...
Here

Possible bugs in RC2 & modules, with fixes...
1
2
3

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update - 11/11/06

Ok, if you get these errors after upgrading....

Warning: filesize(): open_basedir restriction in effect. File(/document - 29.9.06.doc) is not within the allowed path(s): (/home/SITENAME/public_html) in /home/SITENAME/public_html/administrator/components/com_docman/
classes/DOCMAN_file.class.php on line 87

...go into Docman config, change the default directory for files, save it, then change back to the original and save again.

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Using URL parameters in DocMan 1.3 RC2 to control ordering. Still trying to work this one out, but see the 2 urls below for how this should work...
url params
url params 2
...but it isn't working on my Mambo install.

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Instructions for moving from Mambo to Joomla are here