http://www.ema-eda.com/UnisonPromo.html 

Start with creating the CDS_LICENSE_FILE environment variable with as value 5280@yourhostname .
Open/Edit our license.dat and update the "flexhostname" field to reflect your real net machine hostname.
Then, launch setup and choose choose "Setup licensing", point to our license.dat and press "Next" several time.
Ignore the license parsing nagbox which is a nice fake one, and answer yes when prompted to install products.
At the "Control File Location" dialog, just clear up the text box (BLANK) and then press next.
Now you have to choose products to install and finally press next several times

After a reboot you will be done, enjoy this sweet cd

note: Unison ULtra includes the whole OrCAD base level products. If you wish to have the real full bundle
      you may select this as products :

	OrCAD Capture CIS
	OrCAD Capture CIS Option
	PSpice A/D
	PSpice OPtimizer
	PSpice Advanced Analysis
	OrCAD Layout Plus
	SPECCTRA 6U for OrCAD

If you want to use specctra in autoplacer mode you need to get psd+psd license, we on purpose did not include specctra  autoplacer because it is not supposed to be enabled within OrCAD