Our offices in China will be closed from May 1 to 3, 2014 (Thursday-Saturday), to observe the international Labour Day. Meanwhile we will be working on Sunday (May 4), so if you have any questions, don't hesitate to contact us at:
ZWCAD Technical Support: firstname.lastname@example.org
ZW3D Technical Support: email@example.com
We will reply to you as soon as possible, thanks.