You maybe misclicked some option with Easeus and lost the D partition. If the data on the D partition was formatted it would be hard to recover them, or if it was overwritten by another data the recovery of them may result of some or most of them being corrupted.
You can use free program called
Piriform Recuva and try with the Deep Scan options.
Tenorshare Any Data Recovery Free may help or you can try Tenorshare Any Data Recovery Pro with more recovery features but limited by 3GB of recovered data. (Other options may be MiniTool Power Data Recovery with 1GB of recovered data available).
Last option may be a TestDisk... It is preinstalled in Parted Magic (Linux Environment) from where you can recover your data (if possible).
Download from FossHub
It's version from 2013 but fully functional. You need to create a bootable USB with Parted Magic and boot your computer from USB, or burn the ISO on the CD. Bootable USB drive you can create with
Rufus.