From https://chrome.google.com/webstore/detail/arduino-create/dcgicpihgkmccjigalccipmjlnjopdfe
** If the "Try now" or "Buy" button is disabled and you are in a school environment, please using the following page to purchase an education subscription: Arduino Digital Store **
If you're accessing the Chrome Web Store from a network in an educational environment, you will not be able to buy the standard version of the app.