Just trying to help so hope this is the right place. Its the only place I could find via the website.
If you have purchased Studio One 4 within the grace period you will likely have recieved an email telling you to just log in to your account and you will get the option to upgrade to either Sphere or Studio One 5. Some of us are finding there is no option to upgrade, or there is only an upgrade to Sphere.
Firstly it appears you must have Google Chrome as your browser in order to see the option. The option can be found by clicking on your Studio One 4 product. You should find it below the 'Upgrade' option and will be a 'Redeem' button.
Secondly, the redeem section is titled something like 'Upgrade to Sphere'. This is misleading. If you read the text below it should say the redeem button is for both options.
Click redeem and it should open a new window. Scroll down and you should have two options including one to upgrade to Studio One stand alone if you prefer.
I am surprised Presonus havent notified people about this yet, and I am surprised they have designed website account functionality that seems to only support one browser. Hopefully they will get these issues resolved over time. But in the meantime, if anyone is still having issues I hope the above will help.