Version 8.0.0 is out for both Windows and the Mac. It's completely 64bit and runs great on Catalina.
I recommend a totally new install.
The software will let you know about an update.
Version 8.0.0 is a new install from any version 6's and earlier. Be sure to save your presets to the desktop before installing this.
If you decide that the Price for Guitar SightReader Toolbox is ridiculously low for the value of tools, and you want to make a donation... you can do it here.
If you donate $25USD or over, I will send you the entire New Zealand School of music Jazz tune list as a set list - charts, songs, send to transcriber!
For the Mac: After opening the install, right click on the package and select open. To run Guitar SightReader for the first time, open your application folder and Ctrl+click on Guitar SightReader Toolbox and select open. Then it'll open normally after that.
For Windows: Don't worry if you see either a yellow or blue box when you run GSRT... it's safe for your computer. Just click on more info on these boxes and you should be good to install!
Both Mac and Windows like to charge developers money to remove these hurdles and when I start selling at more than 2-3 a month, I will pay it. Until then, know that it is safe!