This software is completely free. If you really want to exchange money for this software, please consider donating what you can to a charity that you believe in.
The latest version of TAPA Version 1.0.10 (Updated on 2017-07-05) can be downloaded here:
Download TAPA portable (non-installer version)
TAPA is currently only being developed for Windows. You will need to install Microsoft .NET 4.6.1 or later to run this software.
There is a good chance that TAPA could be compiled to run on non-Windows machines via Mono. However, I have not personally tried this yet.