The .wsp files are missing from the Nintex folder after selecting the Export option in the Nintex installer. Only the Core.ps1 file is available.

Be sure to save the Nintex installer .exe file locally on the server. A network folder may have policies in place that restrict file transfer or certain files from being copied over.

Verify if Windows Defender or any Anti-virus software is running on the server running the Nintex installer.