Unlike all the others (including Acrobat), Infix made editing a breeze. Strongly recommended.
Avagr8day, Peter, June 2017"By 2020, more than 80 percent of software vendors will change their business model from traditional license and maintenance to subscription." - Gartner
MacOSX 10.8 or above including
Yosemite, Mavericks, El Capitan
Windows 2003, Vista,
Windows 7, 8, 8.1, 10
Runs under Wine (free Windows compatibility environment)