Am 02.09.2014 um 12:03 schrieb Michiel Helvensteijn:
> On Tue, Sep 2, 2014 at 11:30 AM, Mittelbach, Frank
> <[log in to unmask]> wrote:
>>> Even an error message that explains the situation would be preferable
>>> to the standard "File `l3prop.sty' not found" error.
>> ok that's probably better than a warning. Error  and explaining what to
>> change, followed by loading expl3 so that the document can continue
> That seems sensible. Users have probably (and justifiably) become
> desensitized to console-warnings.

I've now added the old modules to the expl3 distribution source ... so 
with the next snapshot update those should appear on CTAN