I was able to download and run the new pk3 file "silent-0.7.2.pk3" four times while testing ET and ET-min. I ran each with and without admin and all played fine for me.
I wonder if you had an aborted download and now have a partial file, something like "silent-0.7.2.TMP". It may be that the partial donwload is corrupted and when ET tries to download and attach the rest of the pk3 file, the result is a corrupted file that crashes ET.
My "silent-0.7.2.pk3" is 3.89 MB (4,084,843 bytes), though Vista64 displays it as 3990 kb.
You could run FA's PK3-cleaner, or you could open your silent folder and look for the *.tmp file or compare the size of your silent-0.7.2.pk3 file to mine (using right-click & properties, if you use Windows).
I see you on this topic SunLight !
Edit: change the "at look" to "and look for"