If the editing station is offline, you must perform an "indirect activation": How to Activate Media Composer
If you are looking for a free version of Media Composer, Avid offers the following official options: Media Composer | First: completely free
The "activation pack" typically refers to the license key or authorization file required to unlock the software after installation. Without it, the software remains in trial mode or is unusable. The Risks of "Free" Activation Packs

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