Failed to import the CSV, and error was not written to plugin log, so there's no way to troubleshoot.
After spending several hours setting up my file and importing and troublehshooting, I discovered that when you import hashed passwords using this plugin, it stores those passwords into your database as simple text, not as MD5.
This plugin assumes when you create your CSV file to import, you are able to see all the passwords for your users, which isn't possible since passwords stored in wp_users table are hashed as MD5. Who would create a plugin with the assumption that you can see all of your users' real passwords.
I couldn't figure out what was happening when I wasn't able to login, until I tested login using the hashed password, not the 'real' password. Not good. Wasted several hours. Eventually I just imported in phpMyAdmin using an SQL import of the user table I exported, and that worked fine. I should have done that in the first place.
I also checked the forums and only found one other user who brought this up. That forum topic was closed, but never resolved by the developer. Someone just recommended importing the passwords using phpMyAdmin, which defeats the purpose of using this plugin.
after trying to import the file, i was forced to reset my password of the admin, the only user i had after the process (https://codex.wordpress.org/Resetting_Your_Password), because i could not log in. this happened 2 times.
"No user was successfully imported, please check the error log."
Error log empty, not working even with example csv
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