I am using windows 11 23H2 and both avogrado 1 and 2 do not start up. I am not recieving any error message, and when i look at the processes in task manager, it starts up for a bit in 32x then closes. I remember I might have had it on my desktop and I used it last time yesterday (25 apr 2025) and today it disappeared
Avogadro 1.2 is no longer supported. In general on Windows, it has an issue with the Visual C++ Redistributable DLL (which can be downloaded here: Latest supported Visual C++ Redistributable downloads | Microsoft Learn)
As far as Avogadro 2, it would help to know what release you’re using. We’ve been trying to track down bugs for Windows users. One user reported success after editing the registry: Avogadro 2 does not start - #7 by whitfieldp
Another user reported that v1.97 worked but not newer versions: Avogadro 2 does not start - #10 by dschanz
I redownloaded avogadro 1.2.0n today and it works for some reason, feel free to lock this post thanks for replying