For Shellter Pro Plus purchase enquiries, please go here and follow the instructions provided.
If you wish to send feedback and/or to report a bug please use the following email address: kyrecon[at]shellterproject[dot]com. [PGP].
Please take some time to read carefully some concepts described in the generic documentation of the community edition before contacting us. Commercial versions include many additional features, such as 64-bit PE files support.
Thank you,
kyREcon