Hello Ashish,
Since the old OfficeWriter forums have been deprecated, please post all OfficeWriter related questions in the OfficeWriter Answers community: http://answers.officewriter.com/.
I have migrated your question to OfficeWriter Answers so that it can receive proper attention. Here is the new thread for your post: http://answers.officewriter.com/can-we-install-old-version-instead-latest-which-we-purchased-now.
Please let me know if you have any questions.
Regards,Alison