@imranullah We are in process of upgrading our application from 7.3.1 to 8.61. There will be some issues always which you need to resolve on case to case basis. To answer your question I dont think there is need for interim upgrade.
@AmitD927 - The reason behind asking this is because for another upgrade of Pega from 7.x to 8.4 there were issues and Pega recommended instead of start to end version direct upgrade, it was recommended to follow an interim update. We believe that this might have been fixed with 8.7.1. But just wanted to hear from the broader forum if anyone else had to go through the same process.
@imranullah We had upgraded from 6.3 to 8.7.1 last week. We faced few issues while upgrading, so we upgraded initially from 6.3 to 7.4 and then to 7.4 to 8.7.1. Whole process should be complete in 8 hrs. But my observation is there is no need to go for interim upgrade if it is from 7.x to 8.x.