This is a tool that I made very quickly to download the 2019 speed skating world cup finals from Yle Areena, because yle-dl couldn't download them at the time. It's very likely that this tool won't work anymore, so it's is only here for reference. I recommend using yle-dl for regular Areena downloading.
areena-go 1-50083241
1-50083241 is the video ID that you can find in the URL.
Please note that this tool only downloads the raw .ts files, so you need to manually combine them into a single video file. ffmpeg is a good tool for this. I'll add step by step instructions the next time I need to update this tool.