Unable to download updates, SMS_DMP_DOWNLOADER and SMS_STATE_SYSTEM critical

[spyder]

When KB4018732 arrived, I was unable to download and apply it. I couldn't find any solution, but I let it be and figured it might work when the next update was released. But today I tried to download KB4019926 with the same result.

After hitting the Download button in the console, the button is grayed out but the state is still saying 'Available to download'.
The only error I see in dmpdownloader.log is ERROR: The manifest.cab was not found.

Component status shows critical on SMS_DMP_DOWNLOADER, but it only says 'Failed to download. Please refer to dmpdownloader.log for further details' with Message ID 9701.

Component status also shows critical on SMS_STATE_SYSTEM, 'The State System message file processing processed one or more files that contained errors or invalid data. Review the statesys.log file for further details'. I'm not sure if that's related at all, though.
Statesys.log has a couple of lines saying

SQL MESSAGE: spProcessStateReport - The record for machine DESKTOP-42FQEU8 (8b060793-7097-4ef5-91a5-1a7dc7ba5636) was not found in the database.    SMS_STATE_SYSTEM    2017-06-09 10:34:19    13540 (0x34E4)
CMessageProcessor - Non-fatal error while processing, handler want retry : 03_REQUEUED_N_lgjtd4ik.SMX    SMS_STATE_SYSTEM    2017-06-09 10:34:19    13540 (0x34E4)
Thread "State Message Processing Thread #0" id:13540 was unable to process file "D:\Program Files\Microsoft Configuration Manager\inboxes\auth\statesys.box\process\03_REQUEUED_N_lgjtd4ik.SMX" now, will retry latter.    SMS_STATE_SYSTEM    2017-06-09 10:34:19    13540 (0x34E4)
Error : already retried n times for file: "03_REQUEUED_N_lgjtd4ik.SMX", moving to corrupt directory.    SMS_STATE_SYSTEM    2017-06-09 10:34:19    13540 (0x34E4)

I'm attaching dmpdownloader and statesys logs, I would be very grateful if anyone is able to help me with this.

Thanks in advance!

Pär

 

dmpdownloader.log

statesys.log