Hi Ashok,
We have not given the version 4.0.0.15 as a public release.
Please have a look at the release version of Essential Studio in the link given below.
http://www.syncfusion.com/downloads/product/default.aspxKindly send a mail to salessupport@syncfusion.com to get the Evaluation key for the particular version.
Thank you for your interest Essential Studio products.
Regards,
Ramu