Many mods are written without any changes, so upgrade for such mods is flawless. So, to avoid problems with version upgrades try to choose mods will less changes in Dolphin core code.

@doctormusic - I agree on many points that the mods are written and actually scary when you upgrade. I have taken sites through the upgrade processes many times on Dolphin, and it is days worth of work for each upgrade. My ExamDiff and other tools get a lot of use when doing upgrades. But the worst part of the upgrade is the core modules which stop working after an upgrade. I have only had 1 module which needed big changes during an upgrade, but it is a constant fight to get things like the ORCA see more forums to work in many cases. This should never happen when you do an upgrade.

@AlexT I agree that many mods are written without changes, but many overwrite the core files and you never know that unless you bu it and unpack it. I think that there should be a link on Unity Market to a txt file which describes the files in the program and a list of the core files changed BEFORE you upgrade. Mods that were some of the best on UNITY were by UE30, in rewriting the events pages to be actually functional. But these were heavily modded core files...... until he just wrote his standalone mod last month. So if you are going to make upgrading easier, you have to make tools available to better check the mods BEFORE purchase.