FileHippo has a smaller but well-curated collection of older MSI App Player builds. They focus on stable releases, not beta versions. Their download speed is decent, and they provide MD5 checksums for verification.
The is a high-performance Android emulator developed through a partnership with BlueStacks, specifically optimized for MSI hardware to bridge the gap between mobile and PC gaming. Overview of Old Versions
Regardless of the version, the MSI App Player typically includes core functionalities that make it a favorite for emulating Android: MSI App Player x BlueStacks