Those answers from off-brand monk are bonkers. Meta refresh has nothing to do with what you want. You’re trying to do a simple download with some prep work, not watch a long running process. If I have time I’ll try to fix up something for you but I’m swamped this weekend. Ajax could make it nicer and cleaner but isn’t necessary. Two CGIs might be a good way to go as well… Your original code looks like it is pretty close to workable/working but I haven’t tested it.