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There is a redirect from /wp-login.php to "/login/".

Probably some plugin/settings cause this issue: can you try to disable all the plugins except ARMember?

Bye!

I have tried in 2 different alterBlog accounts and it works.

What's the account? I can't see nothing here: https://calmavventura.altervista.org/wp-login.php

Bye!

I just tried installing it from the "plugin" section (Plugin -> Add new -> "Plugin ARMember" -> install), I was able to login successfully.
https://i.imgur.com/IU5vhVSm.png

If the problem...