Instal-therm HCR 4.110 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. The software lies within Education Tools, more precisely Science Tools.
This free PC software was developed to work on Windows XP, Windows 7, Windows 8, Windows 10 or Windows 11 and is compatible with 32-bit systems. The common filename for the program's installer is Gredi_co.exe. The actual developer of the free program is InstalSoft. We recommend checking the downloaded files with any free antivirus. The most popular versions among Instal-therm HCR users are 4.8, 4.5 and 4.1.
From the developer:
Instal-therm HCR 4 is designated for designers, installers, maintenance engineers and operators of hydronic central heating systems with convectors (double- and single-pipe systems) and radiant heating systems (floor and wall heating systems).
You may want to check out more software, such as Horrible City Ruins 2, which might be related to Instal-therm HCR.