Hello oldman1881, see : What to do if you can't download or save files

first try Clear the download history, if you does not already done that.

the Reset download actions for all file types it is the other possible solution.

thank you

I can download files, but can not download completed files, for example, a 14M file, only download 11m and claim it is done.

any one encountered this issue

Did you try the Reset download actions for all file types ?

It is possible that your anti-virus software is corrupting the downloaded files or otherwise interfering with downloading files. Try to disable the real-time (live) scanning of files in your anti-virus software temporarily to see if that makes downloading work.

See also:

• http://kb.mozillazine.org/Unable_to_save_or_download_files

did some reset according to your advice and see how.

i think it is not related to anti-virus software, I can download this file late using flashget and IE9.