Hi Daniele, from their conda channel the official command is conda install bioconda::longqc so the others won't work. Maybe if you can share an installation log I could help you. Alternatively there is their conda's tar.bz2 file which you can download and try the commands again. Also make sure you have activated your conda environment, it seems obvious but for many it isn't. If you actually installed correctly, in the bin folder of your conda env you should find the executable. Otherwise clean everything and build a docker image following their github as they recommend longqc_github. Watch out for addictions. Always read before trying commands.. Regards Marco