I now see demotrades.csv, and also understand why it's so short. While I was testing beta versions, at some point I made a clean install, and didn't save the log file. So, I shot myself in the foot. Well, OK, I'll be more careful next time. Sorry for the noise.
Installing keeps the previous .csv files. Only when you manually delete your previous installation, including your own files, they are lost. So when you get a new Zorro version, install it just over the folder of your previous version - that will keep all the logs.
