The problem is that you used the following grep:

grep((0 + $_) >= 99999999)
[download]

You meant to use the following grep:

grep(((0 + $_) >= 99999999), @times)
[download]

Be careful when you omit parens around arguments.

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You must have had different code on your linux system. Side-effects aside,

if (EXPR, @times) { ... }
[download]

is the same thing as

if (@times) { ... }
[download]

on all platforms.

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Note that

grep(EXPR)
[download]

was a syntax error before 5.18. In 5.18, it was changed to be equivalent to

grep(EXPR, @empty)
[download]

The mentions of a syntax error by the other posters is not relevant to the question; they're simply using an older version of Perl than the versions present on each of your systems.