Hi, this is the forum for the mobile version of Basic4GL. The forum for the desktop version of Basic4GL is here, I've checked your account and you should be able to post there too.
The reason why the links to the plugins don't work is because the man who wrote most of them recently moved the files to a different server and the links on the website haven't been updated yet. However I've managed to get the updated links and I'll try and post them in the Plugin section of the Basic4GL forum. :-)
You could try making a post on the Basic4GL Facebook page here, someone should respond and be able to approve your account on the forum. If ever you have difficulty accessing the Plugins again, you can download them from this OneDrive folder.