Hopefully you have enough logs already, but a couple of other bits that may or may not help the troubleshooting.
1) If you right click the offline file and select check online status it will show them as online and allow you to download them.
2) Since it's been doing this I've also been getting plugin outdated errors in account manager for K2S.
Not sure if the second is linked to using a proxy service, when I first started using a proxy it used to return an error along the lines of cannot check your account from the current connection.
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