I tried to run code available at https://github.com/andrefaraujo/videosearch. Requirement of code is opencv 2.4.0. with the upgraded versions error is coming in Step 6: Build SIFT extractor and extract SIFT for each keyframe in database: in ubuntu. we queried for this issue to author and the author replied to degrade your opencv version to 2.4.0. But iam unable to find this version. kindly help on this issue.