I.R.I.S. IRIScompressor Standard - Manual (Page 8)

Installation and Setup
8
If you purchased a regular version you find the activation key
inside the product box.

Then click Next and follow the on-screen instructions.
Note that an internet connection is required to complete the
activation.
In case you do not have an internet connection on this machine
but still want to do the activation, then click Next anyway. A
new dialog box appears. Select Manual Activation and follow
the instructions described there.