We update both Server and Client each time we introduce new functionality that requires to update both. We update separately Server and Client to solve specific issues.
So, if you check periodically this repository download both Server and Client or check dates if you are interested to update only one of them.
Important Note :
From 18/04/2013 release Server & Client have lost compatibility with earlier versions.
Be careful before to update a OpenERP installation containing PLM data that will be lost, to rescue your old data, please, take contact with OmniSolutions.