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Cannot install SEP 12.1.3 on clean install of Windows 8.1 (final version, not beta).

Created: 17 Sep 2013 • Updated: 13 Feb 2014 | 13 comments

Looks to be the same rollback issue that I was having with Windows 8.

It also seems to have killed Windows Defender in the process so now I have no protection at all.  Again.

Operating Systems:

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Rafeeq's picture

Please do not install 12.1 on Windows 8.1 Blue for the moment.  We are working to support this release with SEP 12.1 RU4, due later this year and will have a beta release available soon, which will work and fix the bugs we are currently seeing.

many thanks

TrumpyAl's picture

No need to ask me not to install it - as I can't!?!?! :)

What would you suggest that I DO install?

Brɨan's picture

12.1 is not supported on 8.1 so SEP is not an option at this time. RU4 is due out later this year, which should support it:

I'm not sure what other AV products are currently supported on 8.1

Please click the "Mark as solution" link at bottom left on the post that best answers your question. This will benefit admins looking for a solution to the same problem.

TrumpyAl's picture

p.s. that thread, which I read, was referring to the 'preview', this thread is referring to the final release version of 8.1.

Rafeeq's picture

if sep 12.1.3 is  not supported for 8.1 preview  how can the same product will work on final release :)

12.1.3 is not compatible. 12.1.4 will be released in few weeks you can install that without any issues. subscripe to the post by paul, any update u will get an email

TrumpyAl's picture

Thanks gents, very disappointed, but at least I know to use another product. Irritating with a single PC, but downright disruptive when you have 13 licences that you can't use...

Rafeeq's picture

Subscribe to the post of paul or I will let you know once its released :) Good day

rond79's picture


SEP 12.1.2015.2015 Installed flawlessly on Windows 8.1 RTM (Final) and Preview (Beta) versions. You must disable Windows Defender and Windows Firewall to install properly.

Mithun Sanghavi's picture


I would suggest you to PM Paul Murgatroyd for this.

Currently, the SEP 12.1.4 is under BETA and would be released soon. There is no official release date provided as yet.

Hope that helps!!

Mithun Sanghavi
Associate Security Architect


Don't forget to mark your thread as 'SOLVED' with the answer that best helped you.

rond79's picture

For Installing SEP On Windows 8.1 RTM and Upgrade


SEP 12.1.2015.2015 Installed flawlessly on Windows 8.1 RTM (Final) and Preview (Beta) versions. You must disable Windows Defender and Windows Firewall to install properly.

Update 2:

Note: Do not run or let Windows Update itself.

For those who cannot wait (for security reasons) for SEP 12.1.4 to come out, follow the above instructions if you are doing a clean install. Works with SEP 12.1.3.

For those who did the free upgrade from the windows store, remove the following Windows Updates before installing SEP: KB2882351 and KB2891214. Be sure that you have disable Windows Defender and Windows Firewall. You could reinstall those updates back if you wish.

TrumpyAl's picture

Good info thanks.  I am not in a position to test if this works or not so if anyone else tries disabling both Defender and also this new suggestion of disabling Windows Firewall it would be great to hear how you go.

zebisnz's picture

For me disabling both Windows Firewall and Windows Defender successfully installed 12.1.4013.4013 on Windows 8.1 / Surface Pro 2. With Firewall/Defender enabled I got continuous rollbacks (and this was reflected in SEPM)