Links to some Lertap files are found here. Please note the http:// URL to the master Lertap website at Curtin University, as seen above -- if you're new to Lertap, it's the best reference to turn to, a sweet suite to visit, a veritable cornucopia of documentation and other resources.
Update status: The latest version of Lertap 5 for Windows is 5.10.3 [Curtin University at 14 February 2014]. It is available at Curtin University and may be reached by following "Useful link" (1) below. (The version at ASC, "Useful link" (99) below, is not up to date.)
The "Useful links" further down this page allow you to download a Lertap file or two.
(1) corresponds to the SetupLertap5103.exe file, used to install Version 5.10.3. This version will work with Excel 2010 and Excel 2013. It's a 'Mini' version, fully functional, but limited to processing just the first 50 records of a dataset. Note that it is possible (and easy) to convert this 'Mini version to the 'Full' version -- refer to link (2) below.
(2) links to webpages describing how to license the Mini version so that it is not restricted to 50 data records (license prices are mentioned in link (99) below).
(3) links to the "updates summary" for all versions of Lertap -- use this to see if your version of Lertap may have been updated.
(4) is a link which leads to some sample Flash videos of Lertap in action (made in 2010 and in some need of updating; some of these videos are probably too long, but they all show aspects of Lertap in application).
(5) links out to a website with sample datasets.
(6) will take you to a website with some very practical pointers on using Excel and Lertap (includes numerous examples of Lertap and Excel in action).
(99) links to the Lertap page at Assessment Systems Corporation.
Note that (99) has free 30-day trials of all the Windows versions of Lertap up to version 5.10.2; these are always available; they're fully functional, with no limit on the number of data records. (These trials are available for users with Excel 2003, 2007, 2010, and 2013. Macintosh users with Excel 2011: write to me using the 'Send e-mail' link above, on the right.)