Why did all my excel functions stop working?

[Jadog]

I haven't used AutoIT for a while but then a week ago I attempted to run a compiled executable that I successfully used for years previously and it shows the error "Unknown function name". I opened the au3 file and attempted to debug and found that all my excel functions are incorrect. How is it possible that it worked without issue previously but a year later is doesn't?

[water]

Compiled versions should still work as the Excel functions get included into the Exe. 
The Excel UDF has been rewritten years ago. The function names have been changed as well to not interfere with the old version. 
Please check the wiki for „Excel“.