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A demo version is a full version of the anti-virus that will be operational for 30 days. There are no other restrictions on its use.
A beta version is a preliminary released, not yet officially available for sale version of the program. Beta versions are created to allow users (beta testers) to undertake extensive testing of the product which will enable developers to fix bugs before the program is released officially. Using a beta version always incurs a risk since errors in the program can make its operation unstable or cause system errors.