Win 10 Windows Defender is blocking Babylon 7 installation

Thanks Monkey but I do not use the toolbar, I use the app and looks like they fixed on 2010, right?

1. Installing older apps, may create safety, security, or stability issues within the OS.

2.  "looks like they fixed on 2010, right?"  I don't think so:

https://www.microsoft.com/en-us/wdsi/threats/malware-encyclopedia-description?Name=Adware:Win32/Babylon&ThreatID=152824

https://blog.malwarebytes.com/detections/pup-optional-babylon/

3.  Upload your installer to https://www.virustotal.com/#/home/upload to check it out, (but it is not a guarantee that it will not create safety, security, or stability issues within the OS.)

Consider running adwcleaner, and Malwarebytes Free (not trial, deactivate trial, and make sure it scans for rootkits)..

Please consider turning on the PUP protection in Windows Defender, and running a scan:

PUA Protection is disabled by default and needs to be enabled. This is easy with PowerShell – just run this command line at the elevated PowerShell Prompt:

Set-MpPreference -PUAProtection 1

Then confirm that the value was reset by returning the current state for PUAProtection:

$Preferences = Get-MpPreference

$Preferences.PUAProtection

https://answers.microsoft.com/en-us/protect/forum/protect_defender-protect_scanning-windows_10/windows-defender-not-detecting-known-adware/9cfe114b-8d1b-42a2-8268-34dc3acf9390?auth=1

Thanks Monkey but I do not use the toolbar, I use the app and looks like they fixed on 2010, right?

Why do you want to infect your computer with an older known PUP/malware? 

see:

https://www.virustotal.com/#/home/upload

https://en.wikipedia.org/wiki/Babylon_(software)

On 7 August 2010, Microsoft antivirus products identified the software application as adware (identified as "Adware: Win32/Babylon") due to potentially intrusive behavior.[31] Sixteen days later, on 23 August 2010, Microsoft announced that Babylon Ltd. had modified the program and that it was no longer categorized as adware.[32]

In 2011, Download.com started bundling the Babylon Toolbar with open-source packages such as Nmap. Gordon Lyon, the developer of Nmap, criticized the decision.[33][34] The vice-president of Download.com, Sean Murphy, released an apology: "The bundling of this software was a mistake on our part and we apologize to the user and developer communities for the unrest it caused."[35]

In 2012 the Babylon search toolbar was identified as a browser hijacker that, while very easy to install inadvertently, is unnecessarily difficult to remove afterwards.[11][12][13] The toolbar is listed as an unwanted application by anti-spyware software such as ....[36] Many users, trying to uninstall Babylon, have searched for help on different support forums.[37] The toolbar tends to install itself onto computers as an add-on with other software and changes users' home page to the Babylon search engine, adds the search engine to the computer and sets itself as the default.[14] It changes browser preferences such as the user's home page and search engine, changes that can be very difficult to reverse.[38][39]

On 29 October 2013, Google notified Babylon that it did not intend to renew its cooperation agreement between the two companies, which terminated on 30 November 2013. Google said that complaints had been received from Google Chrome users, claiming that the Babylon toolbar damages the browser's user experience. According to Babylon, Google may have reconsidered the decision during 2014.[15]