Regarding your request for the complete series of (2019) on Archive.org, here is the information available:

Conclusion: To Archive or Not to Archive?

Searching for "chernobyl serie completa archive.org" is a journey into the digital underground of media preservation. You will find the complete series—fragments of siloed data, stitched together by anonymous librarians of the internet. You will watch Lyudmila Ignatenko walk through the hospital, or Legasov recite the list of lies, all streamed from a non-profit server in San Francisco.

102 INT. MOSCOW APARTMENT A CIGARETTE - slowly burns in an ashtray. RECORDED VOICE It's not that we'll mistake them for the truth. Internet Archive Full text of "DTIC ADA335076: JPRS Report, Soviet Union

The Cost of Lies: Revisiting the "Chernobyl" Miniseries via Archive.org

Beyond the dramatization, Archive.org is an essential tool for researching the actual events of the disaster through primary sources.

The hunt rarely yields the full HBO series, but it always yields something radioactive—digitally speaking.

Full Scripts: For a "deep" look at the storytelling, the complete scripts for all five episodes—including the famous "What is the cost of lies?" monologue—are hosted on the platform. Deep Content & Primary Sources