Ok, the "C:\Program Files (x86)" tells me that you are running this on the 64 bit machine. Do you have 64 bit version of the Ghostscript installed ? If no, can you try to install it as there is a chance that your web application is running as 64 bit process under the IIS when it's deployed.
Can you join to chat at: https://jabbr.net/#/rooms/ghostscriptnet ?
Can you join to chat at: https://jabbr.net/#/rooms/ghostscriptnet ?