Hi Antonio,
You can go to below link and download the latest one for upgrade. Please ensure that you go through the release notes.
https://software.cisco.com/download/release.html?mdfid=284850739&softwareid=282046477&os=&release=3.7.2E&relind=AVAILABLE&rellifecycle=&reltype=latest&i=!pp
Since this DDTS affects only 3.6.1 and 3.7.0, you should be able to pick 3.6.2 and 3.7.2.
Regards,
Kanwal
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