AppGuard 4 has still a 30-day trial version. But it's EOL already, so not recommended, unless you want a trial of AppGuard.Sorry for the question ... but AppGuard exists in the trial version? On their website, I can't find information about it.
AppGuard 5 has no trial version.
If you want to test AppGuard, use AppGuard 4. Afterwards, if you want AppGuard, buy AppGuard 5.
AG 4 and AG 5 is almost identical in protection model for now.