Since you do not have an avatar image, please upload one. You can only have one avatar and uploading a new picture replaces the old one. It will take upto a few hours for your new avatar to appear everywhere.
Using mailgun.json file to send emails:
Seems like you're not using git and also using the old bit because MailGun project was dropped more than a month ago.
You can now login with:
Alternatively, you can also follow this repository if you want to setup Frapid + MixERP.
Thanks for update. I downloaded it from https://mixerp.org/forums/thread/539/source-code-mixerp-v2-alpha-with-sql-db. Plesae update the information there for developers downloading in future.