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The official MD5 for a 15.4 ISO is: 0f1a962e8c176896f02a562a3c7e84ab (Double-check this hash on the Internet Archive page before trusting)
The Internet Archive preserves old software legally. The hiren_bootcd_15.4_fixed.iso uploaded by user "OldTech" has been downloaded over 110,000 times with zero virus reports. hiren boot cd 154 fixed link
If you are looking for verified files, it is recommended to use the official sources to avoid potential malware in unofficial "fixed" versions: The official MD5 for a 15
