Hi d1Kuba
You can download previous versions of Windows 10 in ISO format from this safe link, which links into the Microsoft servers, because Microsoft only provides the latest version (2004) directly
https://tb.rg-adguard.net/public.php
Then use Rufus to create a bootable USB . . .
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Standard Disclaimer: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.