Remember that certain prerequisites are needed for the software to work.
The idl4re distribution is made available according to the terms of the GNU GPL (version 3 or later). See the docs/COPYING.txt and docs/gpl-3.0.txt files in the source code distribution for details.
The source code repository is located at the following location:
https://hg.boddie.org.uk/L4Re/idl4re
The repository can be cloned using Mercurial as follows:
hg clone https://hg.boddie.org.uk/L4Re/idl4re
If you are familiar with version control systems and Mercurial in particular, it can be convenient to use this approach to obtain and update the software, although you should be aware that updates made available in the repository may, if deployed, cause the software to not function correctly on occasion, even if attempts are made to avoid such situations. Therefore, you should choose to update with care and be prepared to switch to a "known working" revision if necessary.