I have the same issue as Djfe for few days/weeks, if I correctly understood Adobe has already announced Flash Player 11.9.900xyz, but it's still on beta, that can explain why regular download doesn't work for the moment
but if I registered now on this forum is because of what I read then, it's not the first time I see answers like "it's not under our juridiction / the issue is not ours so there is no issue / it's your fault / we never say we're always right but just admit avast always never be wrong" you know, that always sounds like corporate bad faith, kind of hot potato game as it's a heresy to blame Avast!
I can't say I often had problems with Avast! products, it happened few times... but everytime I searched these forums to find a solution or a similar description of my problem I saw comments like that, I really wonder what's wrong
anyway, if it is the sole responsibility of the user to update their software, why develop a software updater and incorporate the products? after all it is not the role of antivirus to update the softwares or even alert the user, what's the point of simply say "you know, it's like that. on adobe side thay already announced a version 11.9.900xxx but the -legitimate- way Avast! leads you to update doesn't allow yet to proceed because the dowload link on adobe website leads you back to their homepage, so you just have to wait, keep an eye on Flash Player releases, and then update when it is possible, the warning in the Software Updater will then disappear", it would have made a bit more accurate and useful answer, and far less superlicious IMHO.
my 2cts fed up