On the Mac, the Insync client was already installed. When from the icon upper right on the Mac’s screen I went to buy/upgrade, the Insync web page rejects my payment and says the software must already be installed. It is and was. Please provide solution, thank you.
In the check-out page, please enter the Google account associated with Insync.
If you experience the same error, please send us an email to support@insynchq.com.
Have a great day!
Thank you. It was your e-mail that solved this.
@Michael_Austin Thank you. Happy New Year!