Versions and Compatibility with Joomla version

I purchased eDocman in 2012 or 2013 and have successfully used it on a Joomla 2.5 site since that time. I am planning an upgrade to Joomla 3.0 this year and am wondering if my current version is compatible. The extension manager shows the eDocman Package as version 1.5.2 (Sept 2012).
If it is not compatible, what is the process to upgrade?
thanks in advance.

Hi Lowell,
Your Edocman version is very old. You can upgrade Joomla to 3.x, but i advise you to purchase latest Edocman version, because your version isn't work well on Joomla 3.x and it contains some potential issue. Once you migrate your site to Joomla 3.x, you can install latest Edocman version to overwrite existing version without any problem and your existing data won't lose.
Thanks
Dam