Support for checksum is available from the publisher site.
Short description: checksum is an easy-to-use, no-nonsense SHA1 & MD5 hashing program, capable of creating & verifying checksums for files and folders, even whole drives, with just one or two clicks. It's robust, lightning fast, intuitive, and completely customizable....
To speed up your downloads we recommend you use a download manager such as 
Filedoyen is a single or dual-pane file and archive (zip) manager with integrated text, code and hex editors, file and folder compare and search. By combining these separate tools into one, Filedoyen makes file management both convenient and easy.
Sniff out wasted space with The Best Duplicate File Finder available. Space Hound 4 eliminates duplicate and unused files that are cluttering up your hard drive and causing problems. Uncludes File & Directory Management, Zip & Unzip, file Viewers.
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