in reply to Problem installing PMs with PPM

tachyon has a great answer, and likely the quickest. But, what version of ppm are you running? I've got 2.1.5, and Time-HiRes installs just fine.

IIRC, some older versions of ppm had all kinds of problems. If you upgrade at least your ppm or all of AS, likely the issue will go away ( it did in my case ).

HTH
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idnopheq
Apply yourself to new problems without preparation, develop confidence in your ability to to meet situations as they arrise.