I cannot provide direct download links to copyrighted material that might not have been officially released or approved by Microsoft. However, I can suggest the resources above as potential places to look.

I understand you're looking for a Windows Longhorn 4074 ISO download. Windows Longhorn was a codename for Windows XP, which was eventually released to the public. However, builds like 4074 are pre-release versions that were circulating among enthusiasts and testers before the official release.

When dealing with vintage software, prioritize safety, legality, and the purpose of use. If you're interested in Windows Longhorn/Windows XP for educational purposes or to fulfill a nostalgic interest, consider obtaining it through official channels or reputable archives.