Replacing OEM install

Goal: replace the OEM install with generic Windows 8.1 from Microsoft's installer.

Below is the GPT layout of the machine in question. Partition number 4 is the Windows installation. The question is: can I simply install generic 8.1 to that partition without any ill effects on the UEFI bios, e.g. not booting properly?

Also, please advise where the best place to get generic 8.1 is. afaik, one is entitled to the generic installer these days.

Model: ATA HGST HTS541010A9 (scsi)
Disk /dev/sda: 1000GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system  Name                          Flags
 1      1049kB  683MB   682MB   ntfs         Basic data partition          hidden, diag
 2      683MB   955MB   273MB   fat32        EFI system partition          boot
 3      955MB   1089MB  134MB                Microsoft reserved partition  msftres
 4      1089MB  976GB   975GB   ntfs         Basic data partition
 5      976GB   1000GB  24.6GB  ntfs         Basic data partition          hidden

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