You will want to log into your my.presonus.com account and go to My Products>Software. Download the latest version of Studio One 2 and install. If you continue to have a problem, please follow the instructions below:
Being that you have created your account with Google, you may need to reset your my.presonus.com password. Just go to my.presonus.com and use the password reset link. You can then log into your my.presonus.com account and go to "Edit Profile." Change your password to something that you would like to use and use that password to activate Studio One. NOT your Google password. Try using your email address rather than your user name when activating.
Should you be behind a proxy server, vpn connection, or hardware firewall, you may need to do an offline activation. Here is a link to a knowledge base article that outlines that process.
https://support.presonus.com/hc/en-us/articles/210040283--4-Software-Activation-Offline-Computer-