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Here i found the latest version of UGS NX6 full Software with crack.
So why u r just trying the old one or student version and facing problems.
Use this new version and learn new technology by Siemens.
U can download this here
A Bit Torrent client like uTorrent is required to download this link.
But i strongly recommend u, if u like this software then please buy it from Siemens with original License and stop Piracy.
This information is for new learners.