.exe file logging via Action Script

I am having issues figuring out how to log a file using where the path is partly a relevance expression. Any thoughts?

wait __Download\file.exe /v"/qn /norestart REBOOT=ReallySuppress /L*v {pathname of program files x64 folder & “\BigFix\Install.log”}"

I’m on a phone, so can’t test, but your log path, as derived from the relevance, has embedded spaces, so you’ll need to quote it.