ABOUT MYCO-2020 PAT FILE 

In "MYCO 2020 Beta-v4-1-9.zip" , the file "Myco-2020.pat" was not correct.
The paths to the release samples had been omited
This bug has be fixed on december 2020 12th.
If you have installed Myco 2020 before this date, please replace the file "myco-2020.pat" by the new file you can find in this directory.