You can still reinstall Windows 7 on your old laptop in a legal way using clean, original installation media as long as you have a legitimate product key. Microsoft no longer hosts Windows 7 downloads directly after it reached End of Support, but there are still ways to find installation media for it. Many archivists preserve their original media and share it online.
Luckily, I found a collection of Windows 7 RTM and SP1 media at Internet Archive's Windows 7 Collection.
The collection is English-only. If you want to find other languages, you can click the link below to open a search window on Internet Archive for Windows 7 media:
https://archive.org/details/software?tab=collection&query=creator%3A"Microsoft"+Windows+7
For updating an RTM Windows 7 installation to Windows 7 SP1 offline, see:
- KnowledgeBase Article 2505743 for details on installing Windows 7 SP1
- Servicing the image with Windows Updates for details on offline update installation into install.wim
- DISM Image Management Command Line Options for getting started with DISM update integration.
I am unaware if VLSC has Windows 7, but it is unlikely for consumers alone to have access to VLSC, so these instructions are best if you do not have access to the Volume License Service Center.