Scrivener update doesn't install?

I tried to install the update (1.6) several times, but every time, at the end of the installation wizard when I click install, it says some error about files not existing and shuts down.

Don’t worry, I found a solution! I downloaded and installed the new version without uninstalling the old one- they appear to have merged. Now, when I check the info it says version 1.6.0, so I suppose I was successful.