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It seems the update has been pulled back, possibly because the last two updates (9.5.9 and 9.5.16) were buggy and suspended too. Only Fastboot ROM is available at the moment, intended for a clean flash. The database has been updated with a newer Nightly (9.5.20), and hence the Downloads page doesn't hold .17 update anymore. There hasn't been any official acknowledgement regarding this though. We'll have to wait and see if the OTA arrives after sometime, or have to wait for the new Beta this week. Let's hope that the devs fix this and closes the confusion by this week.
Thanks for understanding.
does this means next update will have a size of 1.8g like the last update?
Can't comment on that until the update is released. The full Recovery ROM will be around 1.8 GB while the Fastboot ROM will be around 2.5 GB. OTA can be of varying size. We'll just have to wait and see.