Microsoft has created new ISO files of Windows 7 SP1 (Build 7601.24214.180801) and offers them for download. They are 64-bit versions of Home Premium, Professional and Ultimate.
WalkingCat (@h0x0d) noticed this and posted the download links for Windows 7 ISO build 7601.24214.180801-1700.win7sp1_ldr_escrow within the following tweet.
— WalkingCat (@h0x0d) 14. Februar 2019
This is interesting, because no Windows 7 SP1 ISOs can currently be downloaded from the Adguard website ('Download is not available').