If it is HVAC, water supply and drainage, structural, electrical or other versions, please ask.

If there is a prompt during the registration process: There is an error in the registration process, please check the registration code and administrator authority. Your operating system is WIN7, then right-click the Tianzheng icon-Properties-Compatibility-check box, reopen Tianzheng, a new ID will appear, and then paste the new ID to ask questions. I will help you calculate.

note:

When copying the registration code, don't put spaces after it.