Hello.

I made package and use some actions from PackageActionsContrib.dll. If user haven't this dll these actions don't execute.

How can I automatically detect if this dll is present in target Umbraco?

I try include this dll in package add copy to bin folder - installation work fine, but when uninstall first remove PackageActionsContrib.dll and after execute uninstal actions and these actions fail (((((

Or there is some attribute in package xml file which allow automatically uncheck some files(don't delete) in Unistalling package procedure?

Thanks in advance.