De-installing older versions

Not exactly presales, more aftersales, but just a quick question.
Having Updated from 7.0x to 7.5x to 8.0, 7 and 7.5 are still installed. If I de-install the previous versions, is there any risk that files etc. will be deleted by the de-install routines that will still be required by 8?

I think it is safe. I uninstalled 7.5.30 just to keep 6.5.5 and 8.0. No problems so far.