Am 19.12.2024 um 23:16 schrieb Allin Cottrell:
 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.) 
I can confirm that this worked for me automatically (on Windows 11). The 
download was about 5MB apparently.
thanks
sven