The 403 error is caused by ModSecurity installed on your web host server. ModSecurity sees the name of the .htaccess file itself “.htaccess” as malicious. Yes, of course that is ridiculous. 😉 Run the Pre-Installation Wizard and Setup Wizard to prevent the Root htaccess file from being repeatedly quarantined.
https://forum.ait-pro.com/forums/topic/mod-security-common-known-problems/
Unable to View, Restore or Delete files in BPS Pro Quarantine – 403, 404, 406, 500, ERR_EMPTY_RESPONSE error messages, blank/white page, redirected to your home page (error or no error message) or no errors and nothing works/happens.
To delete all the existing files in Quarantine do these steps:
Clearing/Deleting excessive database entries in the Quarantine table and old quarantined files.
If you have excessive quarantine database table entries and are unable to delete them using the Quarantine Delete Files option use the steps below.
1. Go the BPS Pro > Tools menu/page > DB Table Cleaner|Remover tool tab page.
2. Delete the quarantine database table by clicking the Drop Radio button for this database table: xx_bpspro_arq_quarantine
3. Click the Empty|Drop button to delete the BPS quarantine database table. A new empty BPS quarantine database table will be automatically created.
4. Use FTP or your web host control panel file manager and delete all folders under the BPS Quarantine folder located here: /wp-content/bps-backup/quarantine/
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