The standard installer is a tiny stub . You double-click it, and it begins phoning home to a server to download the 400+ MB of actual emulator files. The offline installer is those 400+ MB ready to go.
Online installers typically force you to download the "latest" version, which might not always be the most stable for your specific hardware. msi app player offline installer better
Regardless of how you install it, the MSI App Player is "better" than many stock emulators because it is specifically tuned for high-refresh-rate monitors and MSI hardware. It supports: Up to 240 FPS on supported titles. The standard installer is a tiny stub