This beast is quite old and requires an old browser with an old Java to be able to access it.
I used versions from PostableApps, as I do for accessing old Dell DRACs. In particular I used FirefoxPortableLegacy36_3.6.28_English.paf.exe and jPortable_7_Update_51_online.paf.exe.
“Install” them in a temp directory. Firefox will go into in FirefoxPortableLegacy36\ and
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