Hi Artem,
SAP Visual Enterprise Viewer is free to use even without purchases of generator or author. Their are certain terms you will have to agree too before downloading. However it is free to download as well as the SDK.
You can download them here.
at store.sap.com and search for SAP Visual Enterprise Viewer.
I am not sure if the direct link will work but you can give it a try.
Hope this helps.
Kind Regards
Fergal.