HCL offers (current version) with a 90-day free trial. No, it’s not 8.5.3, but it can open nearly all NSF files and even run old LotusScript agents via backward compatibility. This is the safest route for testing.
: The Lotus brand was acquired by HCL Technologies. Authorized customers can download supported versions through the My HCLSoftware (MHS) portal . Lotus Notes 8.5.3 Client Torrent
Lotus Notes 8.5.3 was a key maintenance release that focused on stability, fixing approximately 1,200 known issues . It introduced two main configurations: HCL offers (current version) with a 90-day free trial