In the install directory of NX there is a folder PVTRANS
Edit the file tessUG.config
line JtFileFormat = "10" to JtFileFormat = "9"
can also set to 90 or 91 for 9.0 or 9.1
You can also make a copy of the tessUG.config file and set the location using UGII_PV_TESS_CONFIG_FILE environment variable