That happened to me- but I went to the plugin hompage and D-Loaded from there. Smooth as silk, do not give up on this plugin, just go to the home page- it is worth the trouble. They are selling a similar plugin on Code Canyon for $20.00. I recomend this plugin, maybe they will fix the file on WP.org. Thanks Tim
Dear i have been stumbling around to fix this issue. finally i found that the plugin uploaded on the wordpress site is not complete. So i would refer you to the original side of DynamicWP Contact Form. its url is http://www.dynamicwp.net/plugins/free-plugin-dynamicwp-contact-form/
Download it from here and if you got “direct access is not allowed error” then comment the last line in sendmail.php which is
die(“Direct access not allowed!”);
TC