class Version {
    private Dictionary<string, Module> LoadedModules = new ...;

    public GetModule(Type paramModuleType) {
        // If instance yet was created, so return it.
        if(LoadedModules.ContainsKey(paramModuleType.Name)) {
            return LoadedModules[paramModuleType.Name];
        }

        // Else, it will be created and stored for next call.
        return LoadedModules[paramModuleType.Name] =
            (Module) Activator.CreateInstance(paramModuleType, this);
    }
}

var clientModule = ClientModule.From(versionInstance);

public abstract class Module {
    public Version Version;

    protected Module(Version paramVersion) {
        Version = paramVersion;
    }

    static public Module From(Version paramVersion) {
        return paramVersion.GetModule(typeof(Module));
    }
}