Can you please have new versions using the same name, e.g. Simplify3D? That way we have the opportunity to replace of to keep both, but the replacement option makes installing SO much easier. Otherwise I have to go a delete the old versions, remove the dock icon, then add the new version to the dock
Most other apps that I use replace and there is no issue with the dock icon or having to manually delete the old version.
If someone wants to keep the old version (and I don't know why...) that can choose to keep both when copying the new version to the application folder. They could also use a backup in case they missed something to go back and Apple has the better copying as Time Machine asks if you want to keep both or replace.