(Info) Unable to obtain CDM for v16 to v27

[nakamura-work]

Starting around the first week of September, we noticed that older version of castLabs electron can not get a CDM.
Old CDMs that have already been downloaded are still available, but are fatal to new installations.

We've tested in the following environment:

• Windows 10 Pro
• Japan

castLabs Electron version	CDM	Delivery
28.0.0	4.10.2830.0	CUS
27.3.11	N/A	CUS
16.0.0	N/A	CUS
15.5.7	4.10.2830.0	Lorry

We aren't sure if this is expected behavior, but is almost consistent with Widevine CDM support status.
https://github.com/castlabs/electron-releases/wiki#status