During the installation, when it asks for the license, Shareplex returns a error with the license key, but the installation proceeds, in the installation log, you can see this messages:
communicator:ask: Do you have a valid SharePlex for Oracle v. 8.6.1 license?
communicator:select: the License key from 
communicator:select: the customer name associated with this license key from 
communicator:say: WARNING: </splex/prod/install/splex_add_key> terminated 
communicator:say: NOTE: Installation will continue. You may add license keys by executing utility
Besides of the error, the installation proceeds and finish with success, but users can't run sp_cop regarding license error.
In order to fix that, run the utility ./splex_add_key as follows:
1 - Go to $SP_SYS_PRODIR/install
2 - run ./splex_add_key
3 - Choose option 2 on the menu, and add you license key number
SharePlex License Utility
1) Read license key from file
2) Enter license key manually
3) Add license key for alternate host
q) Quit License Utility
4 - After that, press q to quit, and try to run sp_cop again.