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As per the original post.
I am having a similar issue trying to install PROEStudent wildfire 3.0. The DAT file sent to me is not recognized by the install program as a license file.
That program is about 15 years old!
What OS are you using?
Was the license file created for your computer?
Is old but I have never installed it, so it is new software that I just unwrapped.
Using WIN 11. PROE wants to run but it needs a proper license file
License file was created for my MAC Address. It is in the dat file I received. Install program does not recognize the dat file as a license file.
Does the license server install and start successfully?
Wildfire 3 is not supported on Windows 11.