The executable is compressed with UPX 3.91 (executable compressor), which is often used by "bad people" to reduce the executable size of viruses, trojans etc ... it's a good valid compressor, but a bad reputation due to the above mentioned things.
You could just unpack the executable (436,238 bytes uncompressed vs 169,998 bytes compressed) and you've solved the antivirus problem instead of just asking people to disable antivirus software or stop using lamexp until antivirus updates signature database (which could be 1-2 weeks).
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