He two itms links below are both the same thing except the bottom one is encoded and the top one isn't. Without it being encoded the device can't understand where the download link is


Decoded Link:
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itms-services://?action=download-manifest&url=itms-services://?action=download-manifest&url=https://cyrusinstaller.com/app.php?title=GBA4iOS&ipa=https://cyrusinstaller.com/vip/vipapps/GBA4iOS.ipa

Encoded Link:
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itms-services://?action=download-manifest&url=itms-services://?action=download-manifest&url=https%3A%2F%2Fcyrusinstaller.com%2Fapp.php%3Ftitle%3DGBA4iOS%26ipa%3Dhttps%3A%2F%2Fcyrusinstaller.com%2Fvip%2Fvipapps%2FGBA4iOS.ipa