What is the difference between Lite and Pro versions?
Asternic PRO updates data in real time (As soon as it is logged), while the LITE version uses a cron job to incorporate new data at scheduled intervals.
PRO version includes several more reports, has access control and levels, search, agent reports, custom formulas, etc.
The Lite version is free, licensed under GPL3, while the PRO version is commercial software.
For a more in depth list of difference see this table