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Внезапно, даже не надеясь, обнаружил, что бесплатный режим опять работает. Спасибо, что починили! 
Правда, почему-то работает только в Opera 87.0.4390.45 (версия 3.52.2), а в Vivaldi 5.1.2567.73 (тоже версия 3.52.2) - нет. В Vivaldi 5.1.2567.73 тоже кое-как работает. Круто!
When downloading a file at 2+ MB/sec (from yandex.net) Opera heavily eats CPU on my PC (1 core is utilized 50-80%), which makes the browser and other application hardly usable.
I usually download with Download Master, and it doesn't occupy CPU (at least this is hardly noticable) at same speeds.
Opera: 64.0.3417.92 (32-bit)
OS: Windows 7 64-bit SP1
PC: Lenovo B580 / Intel Core i3-2328M 2.20 GHz / 16 GB RAM
It seems to be a know issue, which presumably is (will be) fixed in 66 version.
@burnout426 . thanks for trying to reproduce the issue.
Yes, it happens always on my PC with this file - https://yadi.sk/d/93TjorEtVX3eu (I've tried to re-download it).
When the Downloads window is opened the CPU usage increases a lot, whithout the window it is about 20% which is too high for an ordinary download.