HPGL2CAD 5.0 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. This program was originally produced by Guthrie CAD/GIS Software Pty Ltd.
The most popular versions of the program 5.0, 4.0 and 3.0. The program's installer files are commonly found as HPwin.exe or zfmscheme.exe etc. HPGL2CAD belongs to Photo & Graphics Tools. We recommend checking the downloaded files with any free antivirus. You can execute HPGL2CAD on Windows XP/Vista/7/8/10/11 32-bit.
From the developer:
HPGL and HP-GL/2 .plt files to DXF/DWG converter. All DXF/DWG versions through to AutoCAD 2009 are supported. Allows wild card file naming to be used - i.e. translate *.plt, *.hpgl, etc. Support multi-folio (multi-page) plot files. Each page is output to a separate DXF/DWG file. DXF files can be read by AutoCAD and most other CAD software, as well as a large number of other graphic applications.
You may want to check out more software, such as VFDS, progeCAD 2008 Smart! or VizUp, which might be related to HPGL2CAD.
This tutorial is on how to convert PLT (.plt) files to DWG (.dwg) format using Amethyst PLT-2-DWG 3.0 (Shareware $75.00) by CA Design Associates LTD.