Have the same question and issue.
I have Office 2016 Pro Plus with a Volume License I believe, or maybe it is an MSDNR version. Nonetheless, they have provided us a MSI installer for this but our Project 2019 Pro came only with a click-2-run installer. Does this same method work with what we have so we can install Project 2019 properly along side Office?
What is very odd is that up until recently, our Office didn't reflect any version or build in the About tab under Account. Now, ever since Office Update happened, it now says Click-to-Run with a version and build number... very unusual isn't it??? I have a feeling the system overwrote the app with click-to-run process in order to execute the Office Updates and I'm soon going to have a rude awaking as the system will begin to get confused as to which one is actually installed. I say that because now I see under your Windows, Installer folder, now there are 3 MSI packages installer when there should typically only be 2 file packages: 1) Office 16 Click-to-run Licensing Component and 2) Office 16 Click-to-run Localization Component. Instead, now we also have a 3rd which is Office 16 Click-to-run Extensibility Component.