install component needs 4.0.1 msi

I failed several time to install upgrades : at some point the install says that a component needs functionality that’s in LibreOffice_4.0.1_x86.msi … whih I have deleted from my disk.

Today I downloaded it from Source Forge, it was not easy to find.

My install finished OK this time BUT : I have no idea why a component needs this old version and more importantly what this component is !Is it something I have installed like an extension ? but which ? How can I tell ?

Thanks for help