License cannot be activated as license could not be validated with the license server

Step-1: First check the issue is not due to TLS 1.2 connectivity



Step-2: Check proxy settings


You may be behind a proxy preventing direct connection with gearmage.com on ports 80 and 443. 

In the following TWO files in the Program Files Gearmage program / installation directory,
 
MailAttachmentDownloader.exe.config AND MailAttachmentDownloaderService.exe.config

You can try to change the proxy line here:
    <defaultProxy />

to
<defaultProxy enabled="true" useDefaultCredentials="true">
   <proxy usesystemdefault="true" bypassonlocal="true" /> </defaultProxy>
OR

  <defaultProxy>
    <proxy
      proxyaddress="http://[proxy address]:[proxy port]"
      bypassonlocal="false"
    />
  </defaultProxy>

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