yes; but before you do so you should first verify checksums as Dan Fandrich suggested:
http://curl.haxx.se/gknw.net/7.31.0/dist-w32/curl-7.31.0-devel-mingw32.zip.sha256
http://curl.haxx.se/gknw.net/7.31.0/dist-w32/curl-7.31.0-devel-mingw32.zip.md5
a nice GUI tool for verifying checksums is:
http://sourceforge.net/projects/jsummer/

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** [bugs:#1250] Virus in zip file**
**Status:** closed-invalid
**Created:** Mon Jun 24, 2013 08:49 AM UTC by smiletiger
**Last Updated:** Tue Jun 25, 2013 01:40 AM UTC
**Owner:** Daniel Stenberg
link:  http://curl.haxx.se/dlwiz/?type=bin&os=Win32&flav=-
downing curl-7.31.0-devel-mingw32.zip, found virus in curl.exe!!!
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