It shows three corrupt files, one of which is the master control file, so try reuploading:
Checking file hashes for corrupt or mismatched files
[Checksum failed] /install/checkinstall.php did not match, possibly corrupt or out of date
[Checksum failed] /install/navdata.sql did not match, possibly corrupt or out of date
[Checksum failed] /core/codon.config.php did not match, possibly corrupt or out of date