I ran into a problem when installing LN R8.5:InstallShield wizard stopped the process with a “Installer has been interrupted” error. I tried several times, enabling/disabling security software, changing execution privileges etc without any success.
Then I came across this post, which explains how to fix it - well, that did it for me. You have to be admin on your workstation though. Shortly, you have to set the identity of the IS Wizard DCOM component to “Launching user”.
HTH
http://www.rm.com/Support/TechnicalArticle.asp?cref=TEC155657