User registration
Tenkai is shareware.
A part of its functions is unavailable until you enter password.
The password to enable the unavailable functions is provided when you pay for it.
You can purchase the password at :
http://www.page.sannet.ne.jp/jun_m/tenkai/registration-eng.html
Please read notes carefully before you make payment, and register only if you think it is worthy to pay for these softwares.