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Level 6

As you can see, web tracking is unsupported in V8:
Campaign Classic v7 - Campaign v8 capability matrix | Adobe Campaign

This said, you can implement it on your 6.11 version but think about the future: once 6.11 will be unsupported by Adobe (end of extended support in march 2022), you'll have to upgrade your environment.
If you're implementing it today, you'll have to upgrade only on V7