Split Data - how to make this function work?

Question

I am attempting to use the split data function under the KoolTools Plus Advanced tab to split a worksheet with 2 columns and 100,000 rows into separate worksheets consisting of 24,999 rows each. The function runs but instead of splitting into separate worksheets, it deletes all the rows of my original worksheet past 24,999 and does not create additional worksheets. Also, I  am not able to undo so I will have to revert to a previous version to get my data back.  Does anyone know how to make this function work?