Activate All-Access, or move it to this browser from another device.
Removing only clears this browser. Your purchase stays on your account — restore it any time with your email and the last 4 of your key.
Use the same address you paid with. Your key is locked to it, so this is what restores access on a new device — and what stops someone else using your key.
Enter the address you paid with and the last 4 characters of your key, both from your receipt. Both must match a purchase — that is what keeps someone who only knows your email from using your licence.