Thanks for your response sir. But I will be sending transcripts on my own i.e will request university to send me transcripts for bachelors and masters and after that i will put them in one single envelope along with other docs.
I would suggest not to do that. IQAS clearly mentioned that it should be sent by the institute itself. If you put everything in one envelope then IQAS would know that transcripts are sent by you not the institute. They will straight away reject it.
What you can do is:
1. send your signed application form by yourself.
2. ask institute to send the transcripts. If the institute declines then send the seal envelope as it is without putting it in any other envelope. Make sure you do it from the same city as that of your institute, possibly from the vicinity/locality of the institute.
IQAS takes longer time to process, you dont want to waste time if they reject it.