I don't think installing it manually will work. Support for NPAPI plugins in Chrome was discontinued years ago: https://sites.google.com/a/chromium.org/dev/deve

I don't think installing it manually will work. Support for NPAPI plugins in Chrome was discontinued years ago: https://sites.google.com/a/chromium.org/dev/developers/npapi-deprecation https://sites.google.com/a/chromium.org/dev/developers/npapi... Same for Firefox: https://support.mozilla.org/en-US/kb/npapi-plugins https://support.mozilla.org/en-US/kb/npapi-plugins Not 100% sure about IE, but it doesn't seem like you'll be able to make Flash work there either: https://blogs.windows.com/msedgedev/2017/07/25/flash-on-windows-timeline/#hWGAooLdKZmfbmcE.97 https://blogs.windows.com/msedgedev/2017/07/25/flash-on-wind... I think Firefox ESR might still support Flash for a while, at least until the next release.