• Windows Calculator
  (or any software that helps you convert decimal numbers into HEX)
  
  
• Editors like HxD that can show and modify files in HEX format
  
  
• Comparing software like WinMerge
  ( to allocate Attribute Point )

Use HxD open a saving file, use shortcut Ctrl + F to find a string listed below:
Level_7_5C6E1B894044A18C712694A942B84D2C

Normally, you should find 2 results, the first one is for Level, and the second one is for Carnal Instinct.
To modify the value, find the nearest 'IntProperty..................None', there should be 18 bytes between 'IntProperty' and 'None'

Assuming your Level is 11 (HEX= 0B ) and Carnal Instinct is 100 (HEX= 64 )
If you watch in HEX view, you would find it looks like:
00 00 00 00 00 04 00 00 00 00 0B 00 00 00 05 00 00 00
00 00 00 00 00 04 00 00 00 00 64 00 00 00 05 00 00 00

Now use Windows Calculator to convert your desired number in to HEX number and fill it into corresponding position,

save file and load it in game. you should find your Level changed.

*if you want to modify a larger number (bigger than 255), please search 'little-endian format' on website.

The location of Attribute Points is tricky to find, and it varies as your game process changes, you will need WinMerge to help you.

Open your game and pick a teleport spot which gets you near to an enemy,

arm with your most-used weapon and save.

Modify this saving file, set your level to 0 and this file would be your 'Save-A'.

Then you load the 'Save-A', go and kill some enemy to get your level from 0 to 1.

You should have 3 Attribute Points now, save this file, let's mark it as 'Save-B'

Opne WinMerge, select 'Save-A' and 'Save-B' in system folder and drag them into WinMerge.

You are seeing nothing meaningful now, and WinMerge should note you to view in hexadecimal, follow it.

use shortcut Alt+↓ and Alt+↑ to find a difference within a section of text like:
d992e5d9-4c15-5841-377f-7c94bbd6faa0.......None.....None.....None.....StatPoints.....IntProperty...........Version Number.

Theoretically, you should find your Attribute Points(HEX) between 'IntProperty' and 'Version Number', which should be highlighted.

Modify a value in HEX view, save(replace) the files opened.

Mark down the location(on the left side, like 7FCCFC) of this text and find it in HxD, modify the data after 'IntProperty' using the method you used on level.

Save your modified file 'Save-B', load it in the game, then you should have desired Attribute Points.