There was a download of RocketControl 2.5 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The software belongs to System Utilities.
The following versions: 2.5, 2.3 and 2.2 are the most frequently downloaded ones by the program users. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. This PC program can be installed on 32-bit versions of Windows XP/Vista/7/10/11. The most frequent installation filenames for the program are: RocketControl.exe and RocketDelivery.exe etc. The actual developer of the free software is xorx.
From the developer:
A small program for an Arduino compatible micro controller that controls the flight of a model (water-) rocket. It does control the preparation of the recovery system, has automatic launch detection, an apogee detection system, parachute deployment, and safety timers. All this is managed with the most simple one button and one LED user interface.
You may want to check out more software, such as EOS Utility, iPHUC for Windows or MyGPS, which might be related to RocketControl.