You are in a minority of people who have had issues.
The plugin works but only if you follow the instructions fully and say YES to the pop ups it presents.
Some people have also had issues with thier antivirus too but for the most part that issue seems to have been resolved.
If only the many people who successfully installed the plugin would post then this forum would be full to overflowing.
Sorry you had issues but it is hard to tell what you eventually did correctly as you didnt mention much detail.