Price

The HP-45 is commercial open source and available through the following on-line shops:

I stopped selling by Paypal. It is to much work and one overlooked e-mail gets into much trouble. I also stopped using any any alternative shop. More trouble then it is worth.

1. You always purchase a license for one user and all operating systems. However with most shop you can only download the version for the indicated operating system. If you need additional OS version or the source code send me a mail with your purchasing details.