I've google it but i am still looking for a solution.
Is there a plugin or method to export wordpress users with their advanced custom fields?
I don't want to export ACFs structure but users' data.
You can try a plugin like export user data. It can export users with the user meta. ACF should be from what I remember storing user custom fields as user meta data so they should be compatible, but this will depend on the export plugin.
If this plugin doesn't work you'll need to write a simple script that would loop through the required users with WP_User_Query then get the user data based on user id from ACF which is explained here. You'd then have to print or compile a file in what ever format you want with the data.
Sorry I can't be more specific without knowing the type of file you're trying to export and if and how it needs to be imported elsewhere.
I suggest the Export Users With Meta plugin.
PS: I am the author of this plugin, but I created it after I have found this page but found no answer (the answer suggests a plugin that was closed due to security issues).