Because XAPK files are not standard Android installers, they cannot be opened by the default package manager. You can use these methods to install version 3.7.5:
If you have an older version of the app already, you may need to uninstall it first before the new XAPK will install. Download Haylou Fun V3.7.5 for Android | Uptodown.com Download APK File [XAPK] v3.7.5
You generally need at least twice the file size (approx. 200MB+) available to extract and install an XAPK. Because XAPK files are not standard Android installers,