Sorry about this: there was a mix-up regarding the "addon" function packages for gretl in the 2024d release (from a week ago). This affects our packages for Windows and macOS: these packages were built with addons labeled for "2024d-git", the previous development version, rather than "2024d" as should have been, with the result that they're not recognized as valid. To check your gretl, go to "Help/Check for addons" in the main window. If the correct addons are not installed you should now be offered the option of downloading the correct ones, and hopefully that will put things right. (Just today I corrected the addons file for 2024d on sourceforge.) Another way of correcting the addons is to install one of today's snapshots. Windows: https://gretl.sourceforge.net/win32/ Mac: https://gretl.sourceforge.net/osx.html Allin Cottrell