I found how to resolve issue in point 5.
If you cant sync particular update, for example 2023-04 how in article, you need to find all .psf files that are in this update.
Make SQL query like this
SELECT *
FROM vSMS_CIContentFiles
WHERE CI_UniqueID = '3157dbaf-04f5-49fc-baef-300bbd6d121a' AND FileName like '%.psf' and IsSigned=1
You will get all .psf files from this update that needs to be corrected in DB. Something like this:
You need File_ID's.
Next make new query with your File_ID's:
SELECT *
FROM CI_Files
where FileName like '%.psf' and File_ID in (72057594038044265,72057594038044148,72057594038044262)
And see if that files have IsSigned=1.
Than make update
update CI_Files
set issigned=0
where FileName like '%.psf' and File_ID in (72057594038044148,72057594038044262,72057594038044265) and IsSigned=1
That's it! Problem for this update resolved.
Try to download it again.