Membership area “.htaccess style”

I asked this same in public wordpress support forum. But, I want ask same here: Maybe this plugin is answer. But, I read this plugin manuals many hours, and look “not possible with this plugin”.

Simply, I want make “traditional .htaccess-style protected membership pages”. It is, without wordpress I can simply make folder, make password protection and put all to this folder. index.html, pdf-files, etc etc.

Password protection: Yes, it work in WordPress. Simply “page” and “password protection”. This is enough, BUT if I add some media… it is just in “public wordpress folder” and direct access.

Plugins cannot help me: Eg. “Ultimate member”, “simple membership” this all make very difficult way. Pluginless is also impossible: “check user logged in” ok, but still: no media protection. In history it was easier: simply make password protected folder, as I said.

All my page is “traditional technology homepage”, much public media, pages etc.

Most typical way is, I make user and pw manually, meself. This is quite similar than eg. schools: teacher make homepage and tell username and pw to students. Students can read some documents, fill answering forms etc. Username + pw is not individual: it is, “username: classgrade5, pw”. So, all students use same username and pw. Reason my case is just as school, I use “students”, “class” etc instead customer…

So: I try make password protection incl pages and media, and, as I wrote, “old way is password protected folder”.

mydomain.com/students/class1 is log in page, and username is class1students and password is password.
Or,
mydomain.com/students/class2 and username class2students and pw.. etc…

As you see, this is very simple. Of course I can accept password protected page: it is most easiest way. But, in WordPress it is unpossible protect media. (… “is user logged in” php is excelent, but it is only for posts and pages, for media not…).

I installed this plugin. Then I check settings, shortcodes, manuals. Look this type “protected area” is possible. But: as all other php-jinx, other plugins etc etc this is not answer to “protect media”. So: I can make password protected site, but media files are still public. If this is possible, please tell me some easy steps “how to”.

The page I need help with: [log in to see the link]