Step 1:- Open UC Browser.  . .
             =>>Go to Downloads. . .

Step 2:- Hold the file which download link is expired or which is not                                        resuming. . .
              =>>after holding you got some
                information about the file ...At the last you
                see download page. Copy that link. .  .
                And open that page. . .

Step 3:- And download start again and when you download window that 
              time  rename that file ...

Step 4:- Download upto 200kb. . .
                      And pause.

Step 5:- close the UC BROWSER. . .

Step 6:- Open file manager and goto UC DOWNLOADS folder...

Step 7:- copy the old downloaded (which is not resuming ) file and 
             that file with .dltemp extension. . . 
             In another folder for backup purpose. . .

Step 8:- Now copy the name of new downloaded file 
             and delete and rename the non resumeable file 
             and paste the copied name. . .
            Same for dltemp file...

Step 9:- After that open UC Browser and resume. . .