Do we encounter issues if we upgrade druid from 0.10 to 0.12.3?

Hello,

We are trying to upgrade druid from 0.10.0 to 0.12.3. Would we have any issues if we try to upgrade without downtime http://druid.io/docs/latest/operations/rolling-updates.html ?

Also where can we find 0.11.0 tar.gz file for druid ?

Thanks !