Download of UnP7M 2.0.0.27 was on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. We recommend checking the downloaded files with any free antivirus. This free software is a product of Mauro Barresi. UnP7M relates to Security Tools.
From the developer:
With just a click open one or more .p7m (pkcs#7 signed file) from your PC's browser, decrypts .p7m live and displays the contents of the file. No downtime.
You may want to check out more software, such as FraudLabs Desktop or PowerPoint Key, which might be related to UnP7M.