GL-AXT1800 upgrade blocked with error "-4 fetch firmware name fail..."

Hello there! Yesterday and today I was getting an upgrade offer from version 4.2.3 to version 4.4.5 but when I pressed “Install” I got the error “-4,fetch firmware name fail: network unreachable”. However, since a couple of minutes ago the offer for upgrade to 4.4.5 has disappeared and I get the indication that version 4.2.3 is up to date!
If I understand it correctly, version 4.4.5 has been removed due to too many bugs, perhaps.
Please do not publicize upgrades that are insufficiently tested. I consider your products to be too reliable for that!