Copy/Paste your current license keys, if you have more than one put each key on its own line.

Example (2 keys):

FD4F-8ZBS-ZGJ2-Y7FQ-4KN4-BMY3-FTZ5-SDGS-597C-GDD3-CHSV-H2WP-XNG3
XNG3-H2WP-CHSV-GDD3-597C-SDGS-FTZ5-BMY3-4KN4-Y7FQ-ZGJ2-8ZBS-FD4F