@Humayon Kabir,
Our site is still having issues. I can’t open a new thread or i would have. I have the current version of Download Manager and still getting critical site errors on any page that uses the button template pluggin. the only way i was able to fix it temporarily was to disable the button template, then at least the pages load.
I have WPDM version 3.2.07 and button template version 1.3.0, which according to your site are current.
Multiple people seem to be having the same issue. Is there going to be a fix soon?