[apache] You don't have permission to access / on this server

For CentOS 8 your /etc/httpd/conf.d/awstats.conf file needs to look like this and you need to stick in your IP address and restart your httpd service unless you want to whole world to have access to it!

#
# Directives to add to your Apache conf file to allow use of AWStats as a CGI.
# Note that path "/usr/share/awstats/" must reflect your AWStats install path.
#
Alias /awstatsclasses "/usr/share/awstats/wwwroot/classes/"
Alias /awstatscss "/usr/share/awstats/wwwroot/css/"
Alias /awstatsicons "/usr/share/awstats/wwwroot/icon/"
ScriptAlias /awstats/ "/usr/share/awstats/wwwroot/cgi-bin/"
#
# This is to permit URL access to scripts/files in AWStats directory.
#
<Directory "/usr/share/awstats/wwwroot">
    Options None
    AllowOverride None
    <IfModule mod_authz_core.c>
        # Apache 2.4
        <RequireAny>
           Require <Your IP Address here>
        </RequireAny>
    </IfModule>
    <IfModule !mod_authz_core.c>
        # Apache 2.2
        Allow from <Your IP address here>
        Allow from ::1
    </IfModule>
</Directory>
# Additional Perl modules
<IfModule mod_env.c>
    SetEnv PERL5LIB /usr/share/awstats/lib:/usr/share/awstats/plugins
</IfModule>

Remember that if you IP address changes you need to update the file and restart the httpd server. BTW you can see your ip address as it looks from the outside by simply googling "my ip"