You need to login the Windows as system administrator or as super user with system administrator's privilege, because isogen module needs full access right to system's TEMP folder.
Maybe you have multiple version of CAESAR installed on your machine, or some other software package which also use isogen dlls by Alias. I have seen this happen on some users’ machine, the problem can be solved by uninstalling other software.
Regards,
Shawn Zhong
COADE, Inc.
_________________________
Shawn Zhong
CADWorx & Analysis Solutions
Intergraph Process, Power, & Marine