Bought a year's subscription to Sandboxie, and then 8 months into it, it went open source just prior to Sophos' sale to Thoma Bravo. Worked perfectly until very recently, when it reportedly became incompatible with certain chromium browsers. First went Vivaldi, then Google Chrome. Brave may well be next. Opera just updated to 71.0.3770.228, which is Chrome version 85.0.4183.121; therefore, it still works on here. It's chromium version 86.x that will put the nail in the coffin for my fave software.
No one currently seems to be developing the 5.x branch despite earlier promises and the other fork has an unsigned certificate at the moment.
Unless there's a miracle: Bye, SBIE. It was nice knowing ya.