Answered question
How can I activate two my upgrades?
Currently I’m using one and the other are locked.
What’s the solution?
Another upgrade slot will be unlocked when you reach level 4 (4500 points). At that point, you'll be able to apply a second upgrade which will come into effect at the start of your next billing cycle.
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Other answers
The upgrades are useless if you don't have opened slots to use them.
