Application versions before environment version upgrade not available

My environment version got upgraded a couple of time in last month (from 11.*** to 11.***) . Now I was trying to revert changes for a particular application and publish an older version. But surprisingly older versions of the application are not available for upgrade. Not sure if this has anything to do with the  environment upgrade though . Any clue ?

Can you download and republish?

Nuno Reis wrote:

Can you download and republish?

I am not able to see anything after some versions. SO I am in an application with current version somewhere around 600. Cannot see anything before 420 to be republished. 

Did you try to search a version on <> ?