I've tried it once long time ago. The issue probably is that the site didn't open properly.
Try to close the window and then access the original link again. If it doesn't work try to clear your cookies.
The waiting time has nothing to do with the issue. It depends on the settings in the uploaders account.
Rapidgator has 3 limitations for free users:
Limited download speed (max 100 kb/s)
max. 3 downloads each day (resets at midnight server time which is GMT+3. I think it's Moscow timezone)
Waiting time is 120 min. between downloads. (from completion of a download until you can start a new download)
If you get a message about a file bigger than a certain size is restricted to premium users, it is because of the settings in the uploaders account. The uploader can choose to allow free download of all files or choose a limit like 500 MB, 1 GB etc.
Limitations of 3 files a day and waiting time between downloads can be bypassed by changing IP. I rarely do it but sometimes I reboot my router and bypass the limitations this way . I usually wait about 10 min. before turning the router on but less like 5 min. might do it. It's important not to turn the router back on too fast, as it then just reconnects to the same settings.