Getting error of Selenium Exception on Katalon 7 when scripts downloaded from older version

Hi,

Today i upgraded Katalon Studio version to 7 and i would like to evaluate the version 7 release. But without providing licence details, i am not able to use Katalon Studio 7 version. This is tedious .
Earlier i was working on Katalon Studio version 7 which is free version and now i would like to downgrade my Katalon studio version from 7 to 6 version.
Please suggest the same asap.