Select “Use data from file in new location.”
What that will do is use the data that is found in the file from the folder you selected which should be your existing data.
Suppose Klok is loading data from folder A currently and you select folder B as the new location. It will leave the old data file in Folder A alone and load in the data found in the file in folder B.
If you choose the same folder that Klok is already looking in (folder A) it should reload the data in the data file.