There is no official "MStar support website" for consumers. MStar distributes this tool only to OEM manufacturers (TCL, Skyworth, etc.). Therefore, every public download is a leak or a repack.
Incorrectly flashing firmware can permanently damage your device. Always backup the original firmware before proceeding. mstar isp utility v508 download top
While version 5.0.8 is widely available on community forums and file-sharing sites like Google Drive There is no official "MStar support website" for consumers