This is a standalone version of Hoxhud' Enemy Health Circle and Damage Popup Standalone.
This is based on version 3.1 beta
Tested on update 151 and should be compatible with most huds.

Enemy Health Circle V2 Standalone
https://modworkshop.net/mod/21390
Damage Popup V2 Standalone
https://modworkshop.net/mod/27993
Damage Popup Alternative
https://modworkshop.net/mod/20810

Extract into the payday 2 directory

Bugs/Issues

Fire damage doesn't  show death skull
Swat turret doesn't show damage taken
The headshot flash is limited to rainbow

To change options open HoxHudTweakData.lua
self.disable_health_circle = false set to true to disable Health Circle
self.disable_damage_counter = false set to true to disable Damage Popup

Changlog:
Added option to turn off enemy health circle
Fixed poison crash
Fixed fire and incendiary rounds damage
V1.2
Fixed mistake with the previous update
If you downloaded r2 you nedd to re download it

Included the source files for the compiled code if someone wants to make a lua only version