Problem with Komplete 8 activation

Hello, on my 2011 imac company team, with which I work normally for my needs, here naded the team together with the KOMPLETE 8 package, whose license I bought in the past.

When you activate the serial, you don't let me do it since Service Center you install is obsolete and if you resort to offline activation tell me it's not available.

I would like to know how to proceed in order to activate a license purchased in the High Sierra.

I have managed to install the version of Native Access, and when serial registering it tells me that it has already been registered before (I suppose when you activate it before the reinstalling). How can I activate it?

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