You are trying to publish the patches of Citrix Receiver LTSR and you get the error : "Patch Download Failure".
Patch publishing of Citrix Receiver LTSR will fail from Patch Connect Plus to WSUS due to some issue in the session keys and hash keys in the download link.
Follow the steps given below to publish Citrix Receiver LTSR updates to SCCM via Patch Connect Plus,
In case if this problem continues, kindly Contact Support
Keywords: Citrix Receiver LTSR & patch download failure