Command and conquer The serial number is already used

Did you only buy it once and try to share it with your friend or did you guys bought 2 copies, one for each of you?

we both buy the ultimate collection

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@ElKojolo wrote:

My friend and me bought Command & Conquer The Ultimate Collection but we want play thogether with lan connection we get the issue that the serial nummber is already used ;/ have anyone a idea ?

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Which game in the collection are you talking about?

i talking about Command  Conquer generals and zero hour