Nem kell szarakodni a W10 telepítő W7 frissítésével, csak csináljátok végig ezt:

Preconditions:
A. You have w7SP1/8.1 activated successfully. This actually doesn't apply to VL Volume_licenses no KMS (loader yes, pre-installations yes, OEM_DM for w8.1 yes, OEM system builder yes, retail yes), since they are officially not upgradeable.
B. Download your original w10 ISO which is suitable for the upgrade path. I.E. W7(SP1) Ultimate upgrades to w10 pro.

Follow these steps closely:
1. Validate your w7 SP1 (W8.1) online, best using IE.
2. Generate a genuine ticket of your installation by:
2.1 Copy gatherosstate.exe from your downloaded Windows 10 10240 ISO to your installation which should be upgraded.
2.2 Run it on your activated and validated Windows. It'll output GenuineTicket.xml. Save this on a USB thumb drive or something.
2.3 Then do a fresh install with your suitable w10 ISO, skip to enter key at setup procedure.
2.4 Once it's installed make sure your internet connection is DISABLED/do not enable the internet connection! Reboot w10.
2.5. Copy GenuineTicket.xml to C:\ProgramData\Microsoft\Windows\ClipSVC\GenuineTicket\ of your w10 installation and reboot again.
2.6. Connect online, it should activate.
I just summarized this.
This method does NOT require the annoying upgrade process itself and avoids issues!
When doing another clean install in the future just install w10 again while being ONLINE. It activates again.

Így lehet tisztán telepíteni a W10-et és utána aktiválni a W7 hitelesítő fájlfával.

Ha meg mindenképpen meg akartok tartani mindent, akkor a frissítéseket ne a W10 telepítőjével töltsétek le, hanem majd utána.

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