Error on installation - Office 365

I'm using Windows 10 and had Office 365 installed on my pc.
The problem was: I had a 64-Bit version installed from the office 365 website which installed it as 64-Bit. For legacy reasons I need the 32-Bit version.
So I deinstalled Office in the Settings > Apps & Features Panel and headed to Company Portal to install the right version.
But it always failes with: Error on installation without further information.
Clicking on the link opens: windows error 0x80070642 site:microsoft.com on a search engine. I have the option to repeat, but it won't work, even after rebooting my computer.
Is there some kind of cache I have to delete or what else can I do to resolve this?

It seems to be because there is residue after uninstalling 64-bit version of Office 365. Please try to completely uninstall Office with the uninstall support tool. You can download the tool from the page Uninstall Office from a PC.

If the Office unistall tool doesn't completely uninstall Office from your PC, you can manually uninstall Click-to-Run installation of Office.

You can also perform a clean boot in Windows and reinstall 32-bit version of Office 365 to have a check.