Re: [WiX-users] Downgrading a Bundle ?

[Martin C. <Mar...@da...>]

@Rob : I don't know why it doesn't work, but i made some experiments and can confirm THAT it doesn't work in 3.9R2. : If i try to downgrade a bundle, a message pops up telling that a higher version of the bundle is already installed, which I first have to uninstall.

However, having read some discussions and reasoning myself a bit about this issue, i think that this behaviour is 'works as designed' and is not too bad. By default, you also cannot downgrade a 'plain' MSI, and there are some good reasons for this default behaviour, as i learned meanwhile. You CAN build a down gradable MSI (<MajorUpgrade AllowDowngrades="yes">), but this always raises an ICE warning. If a bundle containing a chain of MSIs allowed downgrading, this could in generally only work reliably if all contained MSIs were also downgradeable. If some of them were not, the downgrade of the bundle would work under certain conditions, and sometimes fail - could be quite confusing to the end user. 

On the other hand, if an end user desperately has to downgrade,  with the current implementation she has the option to first uninstall the bundle (as advised in the error message), and then reinstall the old version. From my point of view, that's sufficient and pretty clear.