Steve on 17 Jul, 2018 10:14 AM
welcome to the GPGTools support platform. Sorry you are having problems using GPG Suite.
I am not quite sure what you mean by "autoinstall". GPGMail is one component of GPG Suite. So if you download GPG Suite and install it in the default configuration, you will have GPGMail added to Mail.app.
If it is the pinentry dialog asking for your OpenPGP password which bothers you, there are a few options to deal with that.
save your OpenPGP password in macOS keychain: Please see this KB-article on how to manage passwords for your keys.
disable the default to sign outgoing emails in Mail.app > Preferences > GPGMail.
Let me know if that was helpful and if you need further assistance.