Im downgrade to 4.0.6, (before all problems), and delete 3 tables from my DB.
One of possible solutions:
1) Move folder plugin or rename it.
2) Delete 3 tables (backup FIRST). https://i.imgur.com/PHLITDW.png
3) Upload old plugin and no activate.
Beware WP-Supercache, delete cache.
Now im use wordfence and wait por a weeks to use better-wp, when all problems solved, every day a new version…