Hello @aishwarya and welcome to the community 
sad to hear that you are not allowed to update as 7.7 is eol and your organisation should update sooner than later 
coming back to your problem: can you elaborate what you mean with
if you just want to download a list of issues in your project, you can refer to this thread here where you can see on how to access these information via the SQ API and get them as a json object.
hope that helps