_yuanhua I can install the resource pack myself, but none of my friends can. They also cannot install successfully using /iazip It's completely normal for me to use /iazip myself. I have tried all four hosting methods with the same result.
LoneDev You have to ask them to read their CLIENT log, to get more info on why it doesn't load for them. https://itemsadder.devs.beer/faq/identify-why-textures-are-not-shown