Laura, you may want to update your website. You’re still advertising the product and collecting names for the waiting list.
Also, if your justification is honest, in that really the problem is installation, it sounds like discontinuing it is the wrong decision, given that it appears quite popular. Why would you cut off your pro users? Reading between the lines maybe you’ve got a supply chain problem given that it hasn’t been available for some time. Customers react a lot more positively when you don’t make stuff up.
Thanks.