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but I have the license file, I just don't know how to do.
Hi,
your license is probably LOCKED, therefore you do not need to install license manager.
If you use Mathcad Prime, then use information included in attached PDF file.
MH
Here is a links (this documents also can be found in attachment):
"Mathcad Licensing FAQ": TS Miscellaneous: Mathcad Licensing FAQ - PTC.com
"PTC Mathcad Prime 3.0 Installation Instructions":
PTC Mathcad Prime 3.0 Installation Instructions
http://www.ptc.com/~/media/Files/PDFs/Mathcad/Mathcad_Prime_Installation_Instructions.ashx?la=en