Hi piladzisi, can you kindly email us at support[at]brillkids[dot]com and include a few more details:
1. Which specific file isn't working for you - if possible, do provide the download page or the full title of the file so we can test that file
2. Please send us your diagnostic report. For instructions on how to create a report, you may refer to this article:
http://support.brillkids.com/entries/20438423-How-to-Create-a-Diagnostic-Report-for-your-BrillKids-Learning-SystemThere might be a bug or an error in either the file itself or in Little Math v2, so we need to troubleshoot to find the root of the problem.
![yes](http://forum.brillkids.com/Smileys/emoji/ok.png)
We look forward to hearing from you!