It looks like you are either not using a Macintosh or you are using a version of macOS older than 10.12 (Sierra). You will need to upgrade to be able to run Swift for Arduino.
Swift for Arduino costs $10 to buy a copy for unlimited use for one developer.
Click the "Pay by Card" button below and you will see a popup powered by Stripe (TM),
asking for your card details, email and a billing address.
Once payment is complete, Swift for Arduino will start downloading immediately. Please wait until the download is complete before disconnecting from the internet. If you have any problems with downloading a purchased copy of the software, please contact us on firstname.lastname@example.org explaining what happened and we will attempt to help you with your issues.
WARNING! This application only works on macOS 10.12 (Sierra) or later! If you are not currently using a mac up to this specification you probably don't want to buy the product as it won't work.
We ask for personal information, including email and billing address in case a purchase fails, to enhance Stripe security
and to contact you about any billing queries, not for marketing purposes.
Once payment is complete we will invite you to receive other communications.
You may request that we delete your personal information if you wish, as per normal with EU GDPR regulations, and we will not pass it on to any undisclosed third party unless forced to by law.