Paul - Happy New Year!
What OS and browser are you running? If using W98/XP/W2k and IE5/6 - check IE Internet Options - Click settings/view objects in the Temp internet files area - If you see ACARSX Control - installed - highlight and right right click - try update - if that doesn't fix the problem - go back and select remove. Then access the site and use Check ACARS link and see if it downloads.
If it doesn't, I'd look at any security settings that would prevent ActiveX from downloading.
HTH,
Vic
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