Hi @erfanmhd
For your query,
1) I don’t no why but something is resetting my EDD .htaccess every couple of days.
Ans – This only happens when plugin is activated. It means when you deactivate it and activate it again then it reset your changes in .htaccess file.
There is another work around and I think it will work for you.
1) Navigate to your upload directory /wp-content/uploads/
2) Create a .htaccess file in it.
3) Put the below content in it.
Options -Indexes
<FilesMatch '\.(webp)$'>
Order Allow,Deny
Allow from all
</FilesMatch>
4) Now check by reactivating the plugin. (Note be sure you have original .htaccess file in /uploads/edd folder)
I hope this will work for you ??