I doubt the detection rules are the root cause.  I’ve specified “equals to 
45.3.0.6050” and “equals to 45.4.0.6092”.  I’ve implemented a scripted delay in 
the install of 45.4, and that seems to have resolved the issue.

Regards

Will

Will Spratt
IT Science Support Specialist
Tel:         01904 46 2631

From: Enterprise [mailto:[email protected]] On Behalf Of Jaime Mas
Sent: 06 October 2016 16:07
To: Klaus Hartnegg
Cc: [email protected]
Subject: Re: [Mozilla Enterprise] SCCM always rings twice

Check your detections rules anyway... if you want to use supersedence, you 
generally need exact detection rules. If you are using something like "versión 
< 45" it might happen that you will be detecting the wrong thing.

Anyway, unless you have really good reasons to uninstall the previous version, 
I would just avoid supersedence for Firefox. It's painful to manage and in the 
case of Firefox I think it doesn't give you any added value to remove the 
previous version, as the upgrade of the already installed application is done 
fine. In this case, you just set a detection rule of the type "version > 45.3" 
for your new deployment, and everything works like a charm.

Unfortunately, for other software (i.e. Java) you have to remove the old one 
and then you have to play with supersedence.

Best

--
Jaime

On 4 October 2016 at 12:55, Klaus Hartnegg 
<[email protected]<mailto:[email protected]>> wrote:
Am 04.10.2016 um 10:08 schrieb William Spratt:
The issue is that the first attempt is consistently failing,
intermittently uninstalling 45.3, but not installing 45.4; then
clicking retry in Software Centre results in successful installation
100% of the time.

This is probably a race condition. The uninstaller spawns a background process 
to do the work, and immediately exits. Thus the uninstall process is still 
running while the installer is already installing the new version.

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