Here is a trick to resume failed/expired download in UC Browser...
STEPS-
1. Open ur file manager and goto UCDownloads folder.
2. Cut that file and .dltemp extention file of same name.
3. Paste them in any other folder.
4. Open UC Browser, hold that file and get details of that file, copy file url.
5. Delete that file , open that url and download again.
6. Let it download upto 300 kb and then pause the download.
7. Exit UC Browser and open file manager, goto UCDownloads folder delete that file with .dltemp file.
8. Cut the previous file with .dltemp file and paste it to UCDownloads folder.
9.Now open UC Browser and resume download and let me know whether it worked or not
