thumbnail preview for individual file, not exactly sure about the implementation of that feature as not so many people asked for that :).
but you still can submit it in feature request. Add-on coming within this month.
1) ok i’m adding that option with short-code [wpdm-all-packages]
2) give me your url to check
3) press enter to search is very common practice even for non-tech users, anyhow to add submit button your have to edit in functions.php line # 1811
if that is a multifile package, please check your server cache memory, which should be larger then 150mb. also please check if output buffering disabled.
icon issue may happen if your cache dir not writable. anyhow, please send a temporary wp-admin login info to support@wpdownloadmanager.com to check your issues
