Hello Tony. The promotion price of ZenTao Pro permanent license for small teams (up to 10 users) is 10 US dollars. Can you send an email to Renee@cnezsoft.com? I will take it from there. Thanks.
ZenTao license is binded with the MAC and IP of your server, so you have to add that when you buy the license. @quocnho I also added you on Skype (Nature Easy Soft) and will solve the registration and purchasing problem with you.
Is it possible in open source version that multiple team have their own Admin/logins?
It is not supported directly now. If teams is more than 3, we can help to support that in 'zentao Pro' or 'zentao on cloud'. If teams is less than 3, we suggest you could install multiple zentaos to support multiple team. You also can contact us by email of Renee@cnezsoft.com , Thanks.