hi folks,
i want to restrict my plugin feture for trial versions i dont know how evaluvate user enter version trial version or paid one can you any help me to fins out.
Thank in advance.
Answer in two folds 
First, you can get a PluginLicense from the PluginLicenseManager. Once you get the license, there’s a method called isEvaluation().
Now that the technical side has been answered, I would strongly advise NOT to do that. You should offer a full version (all features) during a trial. Customers will not bother trying an add-on that offers partial functionality and especially if other similar add-ons exist. Maybe you have a valid reason for doing so but you should be thinking twice before doing it.
Thank you very much for your timely help.