If you own a 'BASIC' license you can always upgrade to the 'PRO' version of the same software package. 
For example: If you own a license for ARC396BASIC you can upgrade to ARC396PRO. 
You can not upgrade to other packages, so if you own a licens for ARC396BASIC you can not upgrade to ARC996PRO.
Upgrade process:
 - purchase the upgrade product using one of the links below
 - within 24 hours you will receive an email requesting to email us your ARC BASIC license 
 - we will then issue a new license for the PRO version
IMPORTANT:
Upgrades are processed manually so it takes some time before they are processed. Typical processing time during weekdays is 24 hours.
Cost per upgrade is US$ 35.00
| ARC-536 UPGRADE BASIC>PRO * | 35.00 | 
| ARC-XT UPGRADE BASIC>PRO * | 35.00 | |
| ARC500 UPGRADE BASIC>PRO * | 35.00 | |
| ARC396 UPGRADE BASIC>PRO * | 35.00 | |
| ARC996 UPGRADE BASIC>PRO * | 35.00 | |
| ARC15 UPGRADE BASIC>PRO * | 35.00 | |
| ARC15 UPGRADE LITE>PRO * | 45.00 |