If this is what you encounter, then it's normal. One has to wait for 2 minutes (after the last download is over) to download the next file.
You can only download one file every two minutes. You have recently started a download. Please wait for two minutes for your next turn to download. The system will automatically retry in --- seconds. You can retry yourself by clicking here. Go back to the page you were viewing. If you face problems downloading after the allocated time, we recommend you use Firefox to browse our site.
At times, if there is any problem, one can get around it by closing all tabs, logging out, and then re-logging after some time. Alternatively, use the Firefox browser, as recommended.
Warm regards.