This is a problem worth promoting to the top of your queue. I just cleared more than 30,000 cache files from a small, low-traffic website. The out-of-control wpdm-cache put us over our host’s file limit, which then limited our site’s operations. The wpdm-cache folder is accumulating more than a megabyte’s worth of cache files per day — and most days we have zero downloads.
This should not be considered a feature request; it is a flaw.
