Standard personal licenses are limited to one machine. For multiple devices, consider the Family or Team packs.
Avoid downloading files from unverified sources (like random Google Drive or Google Doc links) that claim to offer "free activation codes" or "cracks". These often contain activation code for airy youtube
Enter your email address and payment details. Once the transaction is successful (via credit card, PayPal, or Apple Pay), you will receive an email from the vendor. Standard personal licenses are limited to one machine