How can I delete watch faces from the download queue? I don't have a blue Cross either via the app or logging in to website

I have same problem. :( Did you find out how?

How many slots are free on your watch ?

11

Ok, have you already closed the Connect IQ app and deactivated the Bluetooth on the watch? Then open the app again and switch the bluetooth back on. The app should then install itself. You can then uninstall it.
If this does not work, it is best to try it via Express on the computer.

The app is installed already, but phone always shows message, that cannot install...

Have tried to deinstall via Express and then install again ?

No. I will try later. 

In the end, I contacted Garmin customer services and they cleared the queue for me. A bit daft I couldn't do this msyelf really!

Good that it has now been solved. I've never experienced anything like this since 2016.