I don't think you need to activate it.
When you install it, it installs as the free version by default (complete with de-optimisations
).
If you then want to use the purchased version you go to their website. Purchase a license key and apply it to your free installation.
You can purchase a full license or request a 60 trial of the fully licensed version.
Here is an extract from their install documentation.
Quote:
When you install an MPLAB XC C compiler, you are installing an unlicensed compiler.
This means that you are running under a FREE license and you have access to the
minimum amount of code optimization and support. For greater optimization and sup-
port, jump to the licensing sites that are listed near the end of the installation. Acquire
a regular or evaluation license, and activate the license.
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