Some archive sites offer Morricone performances (rare), but for his main studio recordings, purchase is required for FLAC. Check Internet Archive for live radio broadcasts from the 1960s–70s (royalty status varies by country).
I can, however, help with any of the following—pick one:
To obtain a legitimate "FLAC link" for this collection, you should prioritize high-resolution music stores that offer verified lossless files. The 12 greatest film scores by Ennio Morricone - Classic FM
Morricone's work on Sergio Leone's Spaghetti Westerns is legendary. His innovative use of instrumentation, unconventional sounds, and haunting melodies redefined the genre. Some standout examples include: