I found many hints how to upload data into Colaboratory.
But now I want to do opposite -> I want to download .csv I\'ve created in Colaboratory workspace.
Ho
You can use the file manager panel.
Use View > Table of contents to show the sidebar then click the Files tab. Right-click the file and select Download.
Note: the process is unusual in that the download progress is not shown in the usual way in the browser. Instead it is shown by an orange circle next to the file in Colab. Only when the download is complete does it appear in the browser downloads.
In Firefox, it's best to keep the tab in the foreground while the download is in progress as otherwise it can fail.