You need to copy the Unix portion of ucopy to the Unix host computer. Instructions vary depending on the type of remote machine you are connecting to. Refer to page 12 in the ICETEN User manual for the correct procedure.
If the Unix ucopy was copied to the remote machine, then the most likely problems are either it did not get placed in the proper command directory, or the permissions were not set properly.
A good diagnostic test to see if the remote ucopy is accessible is to run a session, (but not the Windows ucopy), and at the Unix command prompt type in either:
ucopy
ucopy -h