SDL Trados Studio 2015 Freelance Plus reinstallation issue

I need your urgent help regarding the following issue:
I purchased the above version from your site 16 Nov. 2016. My account ID is 277861.
Invoice Number is 429666.
Licence key is : xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.
Due to some technical issues I have to format the machine and have to change the hardware, But after that I am unable to reinstall the trados version in my system.
Please help me in this regard to solve the issue, so that I can install it again and work on.  
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