'htaccess fails to allow domain access to sub-directory

I have a sub-directory on a site with a zip file in it. I want to limit access to the zip file to certain domains. I have tried many methods but none are working. Below shows what I've tried where example.com is the calling site. I only tried one of these methods at a time but they all return a 403 result. I see many posts here about problems like this and the results are always that they work so I must be missing something. Does anyone have any suggestions?

Method 1

    SetEnvIf Referer "^example\.com/" goodsites
     
    order Deny,Allow 
    Deny from all 
    Allow from env=goodsites

Method 2

    order deny,allow
    deny from all
    allow from example.com

Method 3

    RewriteEngine on
    RewriteCond %{HTTP_HOST} !^(www\.)*example\.com [NC]
    RewriteRule ^(.*)$ - [F]

I added the following and it seems to do what I want.

    <FilesMatch "\.(zip|exe)$">
       Order Deny,Allow
       Deny from all
    </FilesMatch>

.htaccess subdomain

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'htaccess fails to allow domain access to sub-directory

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