old 32-bit installer no longer works on Windows 10 since recent update

I have some 32bit software that I installed on Windows 10 a few months ago.
For some reason I needed to reinstall that software, but now the 32 bit installer crashes.
Has a recent update knocked something off?

(I have tried running it as admin, compatibility mode etc. Not working.)

Caledon Ken said:

Hi Bansaw
Saw your comment "for some reason I needed to re-install"
I have no proof but I'm going to suggest that maybe the original is still installed in some capacity. I would look at manufacture's site for a removal tool and then re-run installer.
Ken

Thanks. I have a portable uninstaller I used after the Windows uninstall. It removed all the relevant registry entries etc. So it did get cleaned properly.

Do you have any third-party antivirus program other than windows defender installed that could be interfering with the installer? Try disabling it temporarily and/or uninstall the third-party antivirus and rerun the installer to see if it goes through.

I installed it in safe mode, it worked that way.