Just log in to the customer portal. If you have multiple license keys, select the license key you want to renew. Then click the Free Upgrades section. Then select the required free upgrade. You can choose from 4SC Pro, 4SC ENT, or 4-1024SC Standard. You can switch between free options in the first year. Remember, we also offer you a completely free year of free hosting-check it out! If your 3CX system requires more simultaneous calls, your partner can arrange a POC. 3CX partners can upgrade their current subscription for 45 days free of charge for editions and simultaneous calls.