Is there a way to check when for the first time a particular plugin was installed in the WordPress?
I need this information to prove my integrity somewhere.
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When plugins were activated is not logged by WordPress. If the plugin hasn't been updated then the file modified time in the file system might be useful for telling you when the plugin was at least uploaded.
If you have regular database backups then you could look at
wp_options to get an idea of when plugins were activated based on which backup the plugin first appears in.