The problem is, that after upgrading OS with setup.exe, controlled by TS, after computer is restarted, TS does not continue to post tasks. Nothing happends. I found these in ccmsetup.log:
Adding file 'http://SCCM.labs.dom:80/SMS_DP_SMSPKG$/LAB00002/x64/LanguagePack/CLP1035.msp' to BITS job, saving as 'C:\WINDOWS\ccmsetup\CLP1035.msp'. ccmsetup 2.8.2015 14:21:57 804 (0x0324)
Failed to download client files by BITS. Error 0x800704dd ccmsetup 2.8.2015 14:21:57 804 (0x0324)
Params to send '5.0.8239.1000 Remediation Error 0x800704dd. Path http://SCCM.labs.dom/SMS_DP_SMSPKG$/LAB00002' ccmsetup 2.8.2015 14:21:57 804 (0x0324)
Sending Fallback Status Point message to 'SCCM.LABS.DOM', STATEID='309'. ccmsetup 2.8.2015 14:21:57 804 (0x0324)
<ClientDeploymentMessage ErrorCode="-2147023651"><Client Baseline="1" Platform="2"/><Packages><Package ID="{3A90876A-8E78-47AA-9618-2796C43BFB28}"/><Package ID="{B8E8F399-A848-4D4E-8ECB-155A86B06720}"/></Packages></ClientDeploymentMessage> ccmsetup 2.8.2015
14:21:57 804 (0x0324)
State message with TopicType 800 and TopicId {4AD94CBF-85D8-4AEF-B514-80FB638F11D5} has been sent to the FSP FSPStateMessage 2.8.2015 14:21:57 804 (0x0324)
Failed to download from DP 'http://SCCM.labs.dom/SMS_DP_SMSPKG$/LAB00002', error 0x800704dd. ccmsetup 2.8.2015 14:21:57 804 (0x0324)
Enumerated all 1 local DP locations but none of them is good. Fallback to MP. ccmsetup 2.8.2015 14:21:57 804 (0x0324)
Cost settings successfully set on '{638E94A1-6E0D-4610-9B21-E7C88FC854E1}'. ccmsetup 2.8.2015 14:21:57 804 (0x0324)
Using branch cache option. ccmsetup 2.8.2015 14:21:57 804 (0x0324)
Adding file 'http://SCCM.labs.dom:80/CCM_Client/x64/LanguagePack/CLP1035.msp' to BITS job, saving as 'C:\WINDOWS\ccmsetup\CLP1035.msp'. ccmsetup 2.8.2015 14:21:57 804 (0x0324)
Failed to download client files by BITS. Error 0x800704dd ccmsetup 2.8.2015 14:21:57 804 (0x0324)
Deleted file C:\WINDOWS\ccmsetup\ccmsetup.xml ccmsetup 2.8.2015 14:21:57 804 (0x0324)
Deleted file C:\WINDOWS\ccmsetup\client.msi ccmsetup 2.8.2015 14:21:57 804 (0x0324)
CcmSetup failed with error code 0x800704dd ccmsetup 2.8.2015 14:21:57 804 (0x0324)
This problem occures only in In-Place upgrade. Wipe and load, and manual client push works as a charm. I used this template:
http://blogs.technet.com/b/configmgrteam/archive/2015/06/16/revised-content-for-the-win10-in-place-upgrade-via-task-sequence-for-configmgr.aspx