attempts to open these and then go to web updates results in the "Application not found" window appearing!
Don't worry too much about the web update; click Help > About & if it says Version 5.4.2 you don't need to update.
I'm not sure what asterisks or orange ticks signify but a complete & activated map should have a green tick. The OS 1:50 GB qct file is 17.9KB but the accompanying qc3 is 2.15GB. If you think that your map installation is less than complete you can do it manually.
Open the folder containing your maps (C:\Maps_v5 ?) Insert the DVD but do not let it start to install. Instead, open up the DVD in Windows so you can see the files on the disc, the idea is to compare it with the files on your computer. There's all sorts of stuff which you may or may not want on your installation but the important folder is the os50 folder. If there is anything there which is not on your computer, copy & paste it to the relevant place in your map folder.