Upgrade from FontLab 7 for only US$ 149.
Free if you bought FontLab 7 on 20 April 2022 or later.
Upgrade from other font editors (FontLab Studio 5, FontLab VI, TypeTool, Fontographer, RoboFont, Glyphs) for US$ 459
https://www.fontlab.com/font-editor/fontlab/#buy