its because downloading the zip, the server must have lost connection. im not sure,because http range header message possibly means the itch.io port may be impossible to connect with. try to connect with a lan cable,or there is a possible problem with your wifi. in that case im saying that you may use chatgpt to change some settings. if it doesnt work,i have no idea. it may be the fact that the http header for the downloads doesnt work,but the only solution possible in that case is report the exact error message to itch.io or the author of the game and wait
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some wifi routers or hotspot cant get on/download from not secure sites(HTTP). in that case try using a different connection,then when you downloaded you can switch back to your usual one. else you can simply try to change your connection settings,but it is not always possible. if nohing of what i previously said works,im lost. try using a vpn or stuff,but if nothing of what i said works,i doubt this one does