How to install Inventor Series 10 (very old) on a Windows 8 or 10 machine?

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I've been using Inventor Series 10 (very old version) on my Windows 8 laptop for about 4 years now. All of the sudden it pops up that it needs to be registered. I have the serial number and activation code but it says they do not match. Any ideas why this happened and how to get around it???
I tried to reinstall it and it said the operating system is incompatible. I remember one of my software engineers had to jump through hoops to get it installed on this computer and I no longer work with him and he doesn't remember what he did. I've searched and can't find an install procedure for this. If it is possible I can install it on a Windows 10 computer but I'm assuming the same operating system error will come up.
Can any of you point me in the right direction to get this fixed? Is there a way to edit the registry with the serial number and activation code or is there a procedure to install this old version on a new operating system?
Thanks for any suggestions whatsoever.