ESBCalc - Advanced Calculator with paper tray

Hi guys,
I've know this great calculator for a long time.
They have a paid version and a Free version.
Take a look here: http://www.esbconsult.com/esbcalc/esbcalc.htm

And here is the license.
ESBCalc (TM) - version 6.2.1 Released 19 July 2007
Copyright (C)1998-2007 ESB Consultancy
Email: support@esbconsult.com
Web: http://www.esbconsult.com
You are free to use ESBCalc as you see fit provided ESB Consultancy's Copyright is maintained. An Email or Postcard saying that you are using ESBCalc would be nice, though not obligatory.
You are, however, specifically prohibited from charging, or requesting donations, for any copies of this program as it stands; if you wish to include it on a CD that is sold at a reasonable price please notify us of your intent by email - we normally are happy to grant permission.
ESB Consultancy makes no guarantees regarding the capabilities nor the "Safeness" of this product. It is free after all, so you take all the risks
ESB Consultancy makes no promise of support for this product, however we are happy to receive Email comments and we do take all feedback seriously.
Note: ESBCalc Pro is the commercial version of ESBCalc and falls under a different license. ESBCalc is Freeware whereas ESBCalc Pro is Commercial.
---
This license agreement shall be bound by the governing laws of Western Australia.

Seems like they allow distribution although we'de need to file for their consent.
I would gladly contact them 1st to know if they're ok to have a portable version.
Nevertheless before that I'd like to know if someone would be interested in this one.
I am.
Cheers