(imported comment written by Nuffer)
The answer is
files
whose
(name
of
it
does not contain
“avagent”
AND
name
of
it
contains
“.log”
AND
creation time
of
it
=
maximum
of
creation times
of
files
whose
(name
of
it
does not contain
“avagent”
)
of
parent folder
of
it
)
of
folder
“C:\Program Files\avs\var\clientlogs”