It looks like you are not getting the updated data because your connection to the file is not correct.
Where do you store your updated .csv? Is it the same place like your referenced lib:?
To check if you are pointing to the right file go to Data Load Script - > Data connections and click on Selected data icon.
many thanks for that - yes I changed the location of the files and saved them on the Remote Desktop Connection for Qlik Sense Server: C:\Qlik\Files\My Folder and changed the location in the script:
[201605 Customers May 2016]:
,MonthName([Transaction Date]) as 'Transaction Month'
FROM [lib://My Folder 201605 HR Med.Group May 2016.csv]
(txt, codepage is 1252, embedded labels, delimiter is ',', msq);
This seems to work well now.