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Установка:
1. Ставим EventScripts v2.0.0.248c Public Beta
2. Распакуйте файлы из архива к себе на сервер
3. В autoexec.cfg пропишите строку es_load looneytrails

Настрока плагина:
После установки запустите сервер. Плагин сконфигурирует параметры.
Далее идем в (путь) папка сервера\cstrike\addons\eventscripts\looneytrails там ищем такой файлик -> lt_config.cfg
Он примерно такго содержания:
// **********************************
// ** Weapon Entity Effect Options **
// **********************************
// Possible choices for effects are "smoke", "energy", "sparks", "dust", "beam", and "random"
// Simply setting an effect to ANYTHING not listed above will mean there will be no effect for that entity.
// Choosing "random" will mean each time a new entity is created of that type, it will choose a random effect for that index

// If you choose "beam" for any effect, please set the Red, Green, and Blue values for that entity
// Please make sure when setting colors to use the format:
// ",,"

// ***************************************************
// ** Choose Effects for Terrorists Weapons **
// ***************************************************

// ******** Terrorists Thrown Grenades ********

// Set to the effect you wish Terrorists to have for Thrown Grenades
lt_terrorists_effect_hegrenade_projectile "smoke"

// Set the ",," values for Terrorists beam color for Thrown Grenades
lt_terrorists_beamcolor_hegrenade_projectile "255,255,255"

// ******** Terrorists Thrown Flashbangs ********

// Set to the effect you wish Terrorists to have for Thrown Flashbangs
lt_terrorists_effect_flashbang_projectile"smoke"

// Set the ",," values for Terrorists beam color for Thrown Flashbangs
lt_terrorists_beamcolor_flashbang_projectile "255,255,255"

// ******** Terrorists Thrown Smoke Grenades ********

// Set to the effect you wish Terrorists to have for Thrown Smoke Grenades
lt_terrorists_effect_smokegrenade_projectile "smoke"

// Set the ",," values for Terrorists beam color for Thrown Smoke Grenades
lt_terrorists_beamcolor_smokegrenade_projectile "255,255,255"

// ***********************************************************
// ** Choose Effects for Counter-Terrorists Weapons **
// ***********************************************************

// ******** Counter-Terrorists Thrown Grenades ********

// Set to the effect you wish Counter-Terrorists to have for Thrown Grenades
lt_counter-terrorists_effect_hegrenade_projectile "smoke"

// Set the ",," values for Counter-Terrorists beam color for Thrown Grenades
lt_counter-terrorists_beamcolor_hegrenade_projectile "255,255,255"

// ******** Counter-Terrorists Thrown Flashbangs ********

// Set to the effect you wish Counter-Terrorists to have for Thrown Flashbangs
lt_counter-terrorists_effect_flashbang_projectile "smoke"

// Set the ",," values for Counter-Terrorists beam color for Thrown Flashbangs
lt_counter-terrorists_beamcolor_flashbang_projectile "255,255,255"

// ******** Counter-Terrorists Thrown Smoke Grenades ********

// Set to the effect you wish Counter-Terrorists to have for Thrown Smoke Grenades
lt_counter-terrorists_effect_smokegrenade_projectile "smoke"

// Set the ",," values for Counter-Terrorists beam color for Thrown Smoke Grenades
lt_counter-terrorists_beamcolor_smokegrenade_projectile"255,255,255"

// ******************
// ** Beam Options **
// ******************

// Set to model to use for beam effect
lt_beammodel "sprites/laser.vmt"

// Set to the width of the beam effect (default = 10)
lt_beamwidth 10

Все что красным можете поменять на свое например Smoke можно поменять на названия которые стоят пред картинками.
Также за место "smoke" можно поставить "Dust"(след),"Energy"(наподобе огненного следа),"Sparks"(искры),"Beam"(луч на мой взгляд самый прикольный)