This isn't a review, just a couple comments.
As of January 8th, 2018 Kedisoft.com is down. The promised update for Totals never showed up, the majority of bugs that were reported early on in release 3 were never fixed. I purchased 9/21/15 at version 3.1. It had two updates till now that I now of. I currently am on version 3.1.5 and have been since some time before 10/30/17. It does work on High Sierra but I do think there is a memory leak in the app as whenever I have it open for any length of time apps become less responsive. Oddly nothing shows up in Activity Monitor to suggest it is a problem app but after several years of using it I know that when I open it, if I have it open for several hours, my computer becomes less responsive which is really noticeable when changing desktops and Safari tabs. When the app is closed, my system returns to normal. In the several years I had the app, I never received a reply from Kedisoft to emails and gave up early on trying to get support. As others have commented, support was/is non-existent; and now so is the site.
Personally, I had purchased this app to get away from Filemaker, which due to constantly changing OS X no longer worked and the required paid upgrade to get to Filemaker to work again was more than the cost of Totals and I was tired of the hassle and cost of FileMaker and thought a simple solution like Totals would be the ticket. It is one of the few apps that supported inventory at this price range along with customizable invoices. When it worked, it worked fine enough but was aways "weak" compared to my Filemaker solution.
Anyway, I would recommend looking elsewhere for an invoicing app as this one is currently dead.