Expected MSE format version 8 error occurred

Hi there,
At present I have MSE version 8 in my computer and it works well. But the error triggers only when I open a file which worked in old versions. Means if I open a file in version 1, error appears. I followed the instructions as per the error message, but no luck. Totally confused, please help me to solve this problem and guide me in right path. Thanks.

Expected MSE format version 8
To convert files made with older versions of Magic Set Editor:
1. Download the latest version 1 from http://magicseteditor.sourceforge.net/download
2. Open the set, then save the set
3. Try to open them again in this program.
