So you're going to install Win 7 on the new SSD and then try to recover your data from the old drive into the new one.
You can install Win 7 as UEFI - GPT as you won't use the old drive to
boot anymore. Even if your BIOS is set to UEFI-GPT, you can read and write to a MBR drive. That's up to you.
1)To make a Win 7 USB boot able drive:
Open a CMD window as administrator and type:
diskpart
list disk (it will list all drives. Identify the USB drive number)
select disk n (replace n by the USB drive number obtained with list disk)
clean
convert mbr
create part primary
select part 1
format fs=fat32 quick
assign
active
exit (to exit diskpart)
If you have a Win 7 installation iso file
On Win 7 use
7Zip to extract all files and folders from the Win 7 iso file to the USB drive.
On Win 10, mount the iso file and copy all files and folders to the USB drive.
If you have a Win 7 installation DVD
On another computer that has ODD, copy all files and folders from the DVD to the USB drive
To make it UEFI boot able you must add the
\efi\boot folder
To make it universal (all Win 7 versions), go to \sources on the USB drive and delete \sources\ei.cfg
2) To install Win 7
Reset BIOS or load defaults.
Set Disk mode to AHCI, not RAID
Select OS mode = UEFI or Select OS mode = other + UEFI (depends on BIOS).
Disable fast boot and secure boot.
Windows can be installed in two ways: Legacy-MBR or UEFI-GPT
To install as Legacy-MBR you
must boot the installation drive as Legacy
To install as UEFI-GPT you
must boot the installation drive as UEFI.
If you have a UEFI BIOS, you should install as UEFI-GPT
Detach any other drives (SATA or Power cable) from the MB.
During POST, press F12(?) to launch the boot menu. You will see two options for the USB drive. USB UEFI (Name) and USB (Name). Select USB UEFI (Name).
Go to install and delete ALL partitions on the main drive till you have one and only one unallocated space and then proceed.
3) For the Win 7 updates
Single file with all updates - Simplix