# Veloce First Start and License Activation
Before your Veloce system can be used, the software needs to be activated using an activation key, which consists of a 4 to 6 digits Serial Number and a 16 to 20 digits Usage Key.
{% hint style="info" %}
IMPORTANT! This information is provided with the purchase of a Veloce software license or during the creation of a Veloce reseller account. If you did not receive this information, please contact your sales representative at PayFacto. If you are a PayFacto employee, contact your manager to obtain a license.
{% endhint %}
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### Veloce Back-Office - First Start
Double-click on the Veloce Back-Office shortcut which was created earlier.
On the first start, the software will update itself and will search for an activation key.
UAC prompts may also appear. Be sure to click Yes if you see these messages, otherwise Veloce will be setup as a Keyless Demo.
You will eventually see an INVALID LICENSE! error message. Click OK.
Once the login screen appears, it will also mention that your license is expired or invalid. Do not type anything in the Password field. Simply click OK.
A limited version of the Veloce Back-Office software will be displayed, with only a few basic functions.
***
### Veloce License Activation
Click on Setup / Utilities.
Click on the Tools menu and select the Installed Licenses... option.
Before activation, the window is almost empty.
Type in (or copy/paste) the 16-20 digit Usage Key and click on the Activate button.
Once the license activation is completed, the Usage Key field will become grayed out. At the same time, the serial number and the list of installed modules will be populated.
{% hint style="warning" %}
IMPORTANT! Once the license is activated, any further modification or reactivation needs to be carried out using a distributor user account. If you don't have this type of account and require modifications or a reactivation of your license, please contact PayFacto technical support.
{% endhint %}
The Veloce Back-Office software is now activated.
The next step will be to start the Veloce server for the first time and add permissions in the Windows Defender Firewall.
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