Just a heads up. As you may know SLES11 SP4 went out of general support at the end of March 2019.
Now, if you try to patch any OES version based on that like OES11 SP3 or OES2015 SP1, you may receive an pop-up notification like the below. It's informational in nature and you can click OK and proceed.
As has been always the case (post end of general support of underlying SLES version, while OES is still under general support), OES2015 SP1 which is still under general support will receive the updates we deem necessary including SLES security updates and OES updates via the OES2015 SP1 update channel.
If you have any questions or comments, you can post here or drop a note to OES@microfocus.com or firstname.lastname@example.org