Just installed SH IV. It never asked me for my serial number from the back of the manual. I was able to run it without problems. I bought the I.5 add-on. When I started SH IV this time, it asked for my activiation key. I copied and pasted the key from the 1.5 add-on and used the internet activation. The game started without any problems. Bottom line, I have only used the 1.5 activation key and never entered the one that came with SH iV intelf.
Don't know if this helps or not.
Jerry
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