Hi tech_support,
Thanks for the usual positive response. I already know now the answer to my question. I need to have an internet connection to download the extensions. I have a PC w/ a connection and the extensions can be downloaded. For the other PC which doesn’t have an internet connection, the mentioned extensions are not visible.
May I know if there is a way to add the extension offline? For instance, I can download a zip folder and add it manually to mBlock 5. Here in our country, most schools don’t have a reliable internet connection. I hope you will add a feature like that in mBlock 5.
Thanks