UPDATE: BPS Pro 13+ and BPS 2.0+ versions have a feature called: Setup Wizard AutoFix (AutoWhitelist|AutoSetup|AutoCleanup) that automatically creates plugin and theme whitelist rules and automatically sets up and cleans up caching plugins htaccess code.
Error Message: You do not have permission to access /wp-content/plugins/thirstyaffiliates/ThirstyLinkPicker.php on this server.
1. Copy this .htaccess code (if your WordPress installation is in a subfolder then add your WordPress subfolder name in the path) to this BPS Root Custom Code text box: CUSTOM CODE PLUGIN/THEME SKIP/BYPASS RULES:
2. Click the Save Root Custom Code button.
3. Go to the BPS Security Modes page and click the Root Folder BulletProof Mode Activate button.
# Thirstyaffiliates skip/bypass rule
RewriteCond %{REQUEST_URI} ^/wp-content/plugins/thirstyaffiliates/ [NC]
RewriteRule . - [S=13]
Example WordPress subfolder path name: MyWordPressFolderName
# Thirstyaffiliates skip/bypass rule
RewriteCond %{REQUEST_URI} ^/MyWordPressFolderName/wp-content/plugins/thirstyaffiliates/ [NC]
RewriteRule . - [S=13]