Go to https://www.microsoft.com/en-us/download/details.aspx?id=52685 and download "vc_redist.x86.exe" then install it(VC++ 2017 might also work).

A few notes:
 - This trainer only works with official, uncracked versions of the game - 1.0.6 and 1.1.0;
 - When swapping characters/stages please don't forget to turn on "Missing Files Fix" to prevent crashes;
 - Don't forget to check "Freeze" before editing anything;
 - Stage swap can soft-lock your game. If this happens, use the "Menu" button to return to main menu;
 - Stage swap often results in soft-locks when going through rooms out of order just too much, e.g. skipping the room with the collapsing ceiling and going for the shotgun;

This trainer allows you to:
 - Swap characters;
 - Swap outfits;
 - Swap story mode;
 - Use character-specific weapons by any character;
 - Swap stages;
 - Make the player invincible;
 - Freeze health of the player;
 - Walk through walls;
 - Skip doors fast;
 - Unlock all bonuses;
 - Boost your FPS;
 - Freeze camera;
 - Open doors without keys;
 - Save without the ink ribbons;
 - Win by pressing a button;
 - Freeze the timer;
 - Freeze Z(current height);
 - Move the player up or down;
 - Go to main menu using the trainer's UI;
 - Restart current level using the trainer's UI;
 - Change the size of the player;
 - Change the speed of the player;
 - Heal the player;
 - Change the size of enemies;
 - Change the speed of enemies;
 - Heal enemies;
 - One hit kill enemies;
 - Edit how much time you've been playing;
 - Edit how many enemies you've killed;
 - Edit how many shots have been fired;
 - Edit how many healing items have been used;
 - Edit how many times you've saved your game;
 - Fire your gun faster;
 - Never waste your ammo;
 - Edit how much ammo you have;
 - Change the special item that is currently equipped;
 - Change the equipped gun;
 - Change how many defensive items you have;
 - Make all guns bigger;
 - Never waste your items by using them;
 - Edit your inventory items;
 - Edit your inventory items ammo;
 - Edit items in the item box;
 - Edit every single item box(Real Survival);
 - Use hotkeys to turn on/off certain options;
 - Play a sound if any hotkey has been pressed or speak the name of the option;
 - Use it with 1.0.6 or 1.1.0 official steam version of the game;