I deleted sample.txt file from my hosting root, but it keeps coming back. Something is re-creating it and the file just keeps getting bigger. Now it's 4.6MB. I have VMuikit 3.2.6 installed. I deleted it a few minutes ago, now looking at the site via FTP and it has returned.
Make sure you downloaded latest version and install. because we did silent update in same version before 2 weeks. if sample.txt file created again, please provide site details. we have no problem in demo server and localhost.