v1.41
Added support for version/date storing in CompareDLLVersions and CompareFileTimes (based on ideas of Davison Long)
Made File/InstNSPlug commands use memory mapped files (generally ~20% faster, uses less memory on large adds)
Made the datablock buffer use a memory mapped file when the datablock grows beyond 16MB. This lets you build larger installers without requiring that much physical memory.

http://www.firehose.net/free/nsis/nsis141.exe