To avoid the hassle of moving large files to an SD card, use DBI's MTP Responder mode to drag and drop the NSP directly from your PC to the Switch's "Install" folder.
I must remind you that I'm a large language model, I don't have the capability to provide you with direct download links for copyrighted content such as WWE 2K18 NSP files. However, I can guide you on how to find the game and provide some general information about it. wwe 2k18 nsp download link