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You may have to contact PTC as suggested here Getting a Licence After Hard Drive repair - PTC Community
Or try Solved: Re: Computer hard drive crashed, need Mathcad 15 l... - PTC Community
Hi @ggesellchen,
I wanted to see if you got the help you needed.
If so, please mark the appropriate reply as the Accepted Solution. It will help other members who may have the same question.
Please note that industry experts also review the replies and may eventually accept one of them as solution on your behalf.
Of course, if you have more to share on your issue, please pursue the conversation.
Thanks,
Anurag