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The problem was i had ref to Episerver.CMS only, in csproj. And the package had no ref to Episerver.CMS.Core. So that package didnt update.
So the solution is to att reference to EPiServer.CMS.Core, and update to latest (now 12.11)
Lesson learned: Add direct ref to packages in csproj.
<PackageReference Include="EPiServer.CMS" Version="12.15.0" />
<PackageReference Include="EPiServer.CMS.Core" Version="12.11.0" />
<PackageReference Include="EPiServer.Framework" Version="12.11.0" />
<PackageReference Include="EPiServer.Framework.AspNetCore" Version="12.11.0" />
Regards Luc
Got this strang error when init CMS after upgrade from 12.8 to 12.15:
SqlException: @Binary is not a parameter for procedure netContentListPaged