The dmg package asks to instal st-stlink-server.1.2.0-3.pkg first before adding STM32CubeIDE to applications folder. Server installed successfully eventually. When I opened the application it started verifying signature/certificate and then throws an error. Picture of the error is attached here.
We're investigating this issue noticed recently for some OSX setups (not versions dependent)
Seems that the os adds some extended attributes on the .dmg when the download is done directly on the Mac, the standard way unfortunately, whereas doing the download on another PC and copying on the Mac works fine...
Anyway, here is the workaround we found waiting for a suitable fix.
$ xattr -cr /Applications/STM32CubeIDE.app (in Terminal.app, and possibly prefixed with sudo)
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Sorry for late reply .. I didn't saw you additional question before.
Those addresses are supposed to be use by STM32CubeIDE itself, the layout behind respect an internal format.
Your issue seems to be related to the network configuration, are you behind a proxy? If so, did you configured the http/https proxies in Preferences > General > Network Connections?
When network settings are correct you should be able to 'Reload' those software sites (Preferences > Available Software Sites), and check the FW updater connection (Preferences > STM32Cube > Firmware Update)
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