TransType 4 is available for both Mac and Windows for $97. My favorite option is TransType by FontLab Ltd, Inc., the purveyors of, FontLab, Fontographer, and other high-quality font-related software. If you find yourself in that situation with some of your mission-critical fonts, there are a few different programs you can use to convert old Type 1 fonts to OpenType. And while I think we can all admit that the Type 1 format is antiquated, those fonts are still in use by some folks and in some cases, OpenType versions simply do not exist. With InDesign 2023 (18.2), Adobe has ended support for PostScript Type 1 fonts.