Thank you for using Arcstar Universal One Virtual service.

Windows 10 is currently supported by the client application (vApp) of our service.
Please download latest (vApp) on this page.

We sincerely appreciate your cooperation.
 

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(Reference) Original message on 22th June 2015 mentioned below;

Thank you for using Arcstar Universal One Virtual service.

According to Microsoft Corporation, Windows 10 will be released in
July 2015, which is not currently supported by the client application (vApp) of our service.
 
Please do not upgrade to Windows 10 if you use the application (vApp) on
Windows since it may be possible that the connection to Virtual Private Network is not established.

We sincerely appreciate your understanding and cooperation.