This plugin supports TeamCity 5.0 and higher. It uses some new API and will not work (without modification) with 4.5.

This may not be easy because plugin uses new API which is not available in 4.5.

In 4.5 if you specify reference to unknown parameter (%autoinc.param%) build won't start because this parameter will be converted to so called implicit requirement (i.e. it should be defined somewhere). In 5.0 a special extension can be written which will provide such parameters.

Also %autoinc.param% is a reference to configuration parameter, but this type of parameters is not supported by 4.5 too (configuration parameters are not passed to a build).

Probably, plugin can be tweaked to work in 4.5, for example, instead of %autoinc.param% users can specify %system.autoinc.param% and add build parameter with some rudimentary value in configuration settings. Then plugin can provide correct values for such properties in fixRunBuildParameters method. Source code of the plugin is available, and you can obtain it from the Subversion repository: http://svn.jetbrains.org/teamcity/plugins/autoincrementer/trunk/