The Electric Quilt is developed for Mac OS, but version 5 wasn't released for OSX. The latest version is compatible with Windows and OSX and this version reached number 7. It's available for approximately $190 from its official website and these are its requirements:
PC System Requirements
Windows XP, Windows Vista, Windows 7, Windows 8, or Windows 10
Internet access (Internet required for activation, deactivation, and periodic validations.)
USB port (for boxed version only)
1.1 GB of available hard-disk space for installation; additional free space required during installation.
Monitor with screen resolution of 1024 x 768 or greater
Adobe Reader
Mac System Requirements
MacOS Version 10.6.8 (Snow Leopard), 10.7 (Lion), 10.8 (Mountain Lion), 10.9 (Mavericks), 10.10 (Yosemite), 10.11 (El Capitan), or 10.12 (Sierra).
Internet access (Internet required for activation, deactivation, and periodic validations.)
USB port (for boxed version only)
1.1 GB of available hard-disk space for installation; additional free space required during installation.
Monitor with screen resolution of 1024 x 768 or greater
Adobe Reader