This version remains popular in legacy industrial refrigeration plants (e.g., supermarkets with R404A racks) that run on pCOe controllers manufactured between 2018 and 2020. If your facility is not using the latest pCO5 hardware, many engineers consider 2.6.46 "the last truly stable build" due to its predictable behavior.
We conducted a benchmark using a standard Lenovo laptop (i5-7300U, 8GB RAM, Windows 10 Pro) connected to a pCO3 controller via USB-RS485. Carel 1tool 2.6.46 2.6.57 SP1
This happens when you try to open a very old (pre-2015) .cpr file directly in 2.6.57 SP1. Carel 1tool 2.6.46 2.6.57 SP1
Searching for "Carel 1tool 2.6.46 2.6.57 SP1" often leads to fragmented forums. Here is a clean installation protocol. Carel 1tool 2.6.46 2.6.57 SP1