This download contains an update to the HiSeq Control Software (HCS), Real-Time Analysis (RTA) Software and Sequencing Analysis Viewing (SAV) Software for the HiSeq and HiScan SQ systems. It is recommended for any system running HCS220.127.116.11 or HCS1.4.8 and lower. For HCS1.4.8 7 users, the release updates recipes and configurations required for use when sequencing Nextera prepared libraries. For HCS18.104.22.168 users, this release fixes a memory leak causing crashes as the first Flow Cell completes. It also reduces the memory footprint of RTA to help mitigate some errors that have been occurring due to communication dropouts (the Flow Cell layout now has 16 tiles per swath instead of 8).