I'm sorry if I can't provide more detailed information.
I'm using OSX El Capitan and installing aircrafts from the official hangar is near impossible.
When I click the "install" button for Boeing 777-300, in the "aircraft" section of the flight gear launcher
the progress bar appeared but never progressed and it stayed at 0.0MB.
One time, there's this "Download of Boeing 777-300 failed: Invalid package checksum"
I did a total computer restart, reinstallation and multiple crosschecks but ended futile.
Can anyone help me solve and decipher that error message? I don't get it at all.
And I don't know why I can't download any kinds aircraft at the moment
I tried to use FlightGear 2017.3.1 and also FlightGear 2017.2.1, but it's still not downloading correctly
Once again, if my information is not detailed enough I would like to apologise.
Thank you for your attention!
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Edit:
After another reinstall, there's an error message when adding the official aircraft hangar in the flightgear launcher.
"Failed to download aircraft descriptions from 'http://mirrors.ibiblio.org/flightgear/ftp/2017.3.1/catalog.xml'. Check the address (URL) and your network connection." But my internet connection is really good.