No, it cannot be set in the web.config.

 

>>but now it is under IIS7 on  a shared server and I don't have access to the applicatiionHost.config file.

 

You can ask your host value of  maxAllowedContentLength.

 

The set MaxSizeKB of uploader based on this value.

 

     <CuteWebUI:Uploader runat="server" ID="Uploader1" InsertText="Upload">
      <VALIDATEOPTION AllowedFileExtensions="jpeg,jpg,gif,png" MaxSizeKB="100" />
     </CuteWebUI:Uploader>