If your BI Server is down no need to try to upload or download the RPD, the component you want to talk with is down ...
As the message you got said you have to check the logs, there is no secret answer like "do that and done", depend on what the issue is.
Sure you are right, after a bit of research i understood this. thank you for your reply.
I cannont download or upload rpd, and the BIserver component is down. In this case what should be the procedure to bring back the biserver component live.
in 11g if the rpd is failed to upload, we can revert back to the old rpd. but in 12c i cannot find a way to change this.
Please go tough below mentioned document and follow the steps of solution only if you have RPD backup or try and export service instance for a possibility to get RPD recovered:
Hope you have backup of your RPD!!
I will say that even if in 11g the BI server was doing versioning it's always up to you, as developer or BI admin, to manage versioning of your own code independently. So already with 11g you were supposed to have your own versioning and this same versioning will avoid you issues in 12c as you have all your versions with logs of what has been added by who all the time.
It's not really the job of the BI server to do versioning (and you actually see it as the catalog isn't versioned at all).
So it's up to you to make sure you have working backups and versioning.
Thanks All for your responses. Solution is to revert to old rpd and restart. worked!!!