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@coltrrpb
-1 - If it's pirated it may not work
0 - Make sure ScriptHookV and ScriptHookNetV are the latest version, I think they have a GitHub page or a Website I can't remember. The version that is here on gta5-mods is not updated anymore* <citation needed, I might be full of bs on this last statement>. To quickly check if SHV/SHVnet are properly installed, make sure that nothing else is binded to your "Ins" key and when you press it in game it should prompt you a "all scripts were refreshed" text box. If you have a bad PC it will also freeze the game just a bit but it's not a crash. If this works than you can sleep in peace knowing the most used library for modding is properly installed so if you encounter any other issues you know it's the mod fault.
1 - Open trainerv.ini with Notepad or alternatives, it should be in ...steamapps\common\Grand Theft Auto V along TrainerV.asi (don't worry about the .asi). Familiarize yourself with the options you have in the .ini file, it is a big notepad indeed but out of the 5.9k lines of options, only ~150 lines are useful things to rebind, most stuff after line 500 is just metadata about cars, tp locations, saved cars, etc.
2 - If pressing F3 does not open the menu, try to see if any other part of the script works. Press N and it should skip to next song while you're in a car, try K and L while in a car(preferably at night), you should see the blinkers. Try pressing K+9, it is the night vision, you cannot miss this. Personally I modified "MenuKey=114" to "MenuKey=122" and from "HideMenuKey=115" to "HideMenuKey=123" this means I open the menu with F11 and close it with F12 since I remember having issues opening it with F3 too. If you want to try this I warn you, Steam takes a screenshot every time you press F12 in a game so unbind that from Steam.
3 - Unbind everything you don't think you need by setting it's value to 0 in trainerv.ini. There are a bunch of haphazardly though binds so be thorough, a good example is K+9 cycles between night vision, thermal vision and normal vision (good bind), K+8 makes your character ragdoll (bad bind, why so close to something useful?) and K+5 makes cops car explode (why bind by default at all!?), I guess the creator wanted to have everything binded even though it made little to no sense to do so and now a 9.5M+ download mod is like a minefield of binds on default installs. There are 3 pages of 2 columns in a readme.docx only for all the binds you will never use for Pete's sake.
3.5 (Huge pet peeve) - If you manage to get the mod working, next step is to look above at a long comment I made, copy all from <<Spawn1Key1=0 // Spawn 1 Default LALT to Spawn26Key2=0 // Spawn 26 Default Z>> and replace everything from line 46 up to line 69 in trainerv.ini with it. This makes sure no combination of "ALT + letter" will spawn a Turismo in front of you.
Reason is: the developer made default state of "ALT + any letter" is to spawn a car (defaults to a Turismo Classic), for reasons he and only he knows, maybe he opens GTA5 just to spawn random Turismos for 30 min straight to then get bored and exit the game, exactly how most people play the game, or maybe he enjoys pressing ALT to switch characters or see if a new mission unlocked just to be greeted by a sudden unwanted Turismo so it was a NECESSITY to have it binded, ok? But I digress, you can disable this feature by simply making the values =0 for Spawn1Key, Spawn2Key etc... in the .ini file, right? NOPE! The developer also forgot to read his own damn instructions in "tarinerv.ini" which say, quote: <<Please don't change the [KeyBindings] header, and also don't change the keynames (GodKeyOn1, GodKeyOn2 and subsequent entries at the beginning of each line). !!!!!!!!Doing that will force the trainer to use default keys as listed in the readme!!!!!!!>> But what does that mean? It means that if you do not see this warning, and the developer clearly didn't, even after modifying what seems reasonable in the .ini file to make Turismos stop spawning by "ALT + letter", only 13/26 letters will no longer spawn cars because ALT + H, I, J, K, L, O, P, Q, R, S, V, W, Y and Z were never fking mentioned to begin with in the .ini file, and never being fking mentioned, the mod uses default keybinds as listed in the readme, and the circle is complete, since default = spawn Turismo. So you need to manually add the missing cases from 13 up to "Spawn26Key1=0" and "Spawn26Key2=0".
The "ALT + letter" inconvenience can be easily fixed by the developer but to fix the gazillion useless binds there are, players need to be trusted by the developer, that they will open the .ini and readme files to see what's under the hood and by power of example and keycodes they will make their own binds since it does not take an astrophysicist to deduce from this example:
NightVisionKey1=75 //Night Vision Default K
NightVisionKey2=105 //Night Vision Default Num 9
that if neither K or Num 9 activated night vision alone, maybe they have to press K and Num 9...
4. Get Menyoo, their UI is way cleaner.

Spawn1Key1=0 // Spawn 1 Default LALT
Spawn1Key2=0 // Spawn 1 Default A
Spawn2Key1=0 // Spawn 2 Default LALT
Spawn2Key2=0 // Spawn 2 Default B
Spawn3Key1=0 // Spawn 3 Default LALT
Spawn3Key2=0 // Spawn 3 Default C
Spawn4Key1=0 // Spawn 4 Default LALT
Spawn4Key2=0 // Spawn 4 Default D
Spawn5Key1=0 // Spawn 5 Default LALT
Spawn5Key2=0 // Spawn 5 Default E
Spawn6Key1=0 // Spawn 6 Default LALT
Spawn6Key2=0 // Spawn 6 Default F
Spawn7Key1=0 // Spawn 7 Default LALT
Spawn7Key2=0 // Spawn 7 Default G
Spawn8Key1=0 // Spawn 8 Default LALT
Spawn8Key2=0 // Spawn 8 Default H
Spawn9Key1=0 // Spawn 9 Default LALT
Spawn9Key2=0 // Spawn 9 Default I
Spawn10Key1=0 // Spawn 10 Default LALT
Spawn10Key2=0 // Spawn 10 Default J
Spawn11Key1=0 // Spawn 11 Default LALT
Spawn11Key2=0 // Spawn 11 Default K
Spawn12Key1=0 // Spawn 12 Default LALT
Spawn12Key2=0 // Spawn 12 Default L
Spawn13Key1=0 // Spawn 13 Default LALT
Spawn13Key2=0 // Spawn 13 Default M
Spawn14Key1=0 // Spawn 14 Default LALT
Spawn14Key2=0 // Spawn 14 Default N
Spawn15Key1=0 // Spawn 15 Default LALT
Spawn15Key2=0 // Spawn 15 Default O
Spawn16Key1=0 // Spawn 16 Default LALT
Spawn16Key2=0 // Spawn 16 Default P
Spawn17Key1=0 // Spawn 17 Default LALT
Spawn17Key2=0 // Spawn 17 Default Q
Spawn18Key1=0 // Spawn 18 Default LALT
Spawn18Key2=0 // Spawn 18 Default R
Spawn19Key1=0 // Spawn 19 Default LALT
Spawn19Key2=0 // Spawn 19 Default S
Spawn20Key1=0 // Spawn 20 Default LALT
Spawn20Key2=0 // Spawn 20 Default T
Spawn21Key1=0 // Spawn 21 Default LALT
Spawn21Key2=0 // Spawn 21 Default U
Spawn22Key1=0 // Spawn 22 Default LALT
Spawn22Key2=0 // Spawn 22 Default V
Spawn23Key1=0 // Spawn 23 Default LALT
Spawn23Key2=0 // Spawn 23 Default W
Spawn24Key1=0 // Spawn 24 Default LALT
Spawn24Key2=0 // Spawn 24 Default X
Spawn25Key1=0 // Spawn 25 Default LALT
Spawn25Key2=0 // Spawn 25 Default Y
Spawn26Key1=0 // Spawn 26 Default LALT
Spawn26Key2=0 // Spawn 26 Default Z

This is the exact "Spawn#Key#" I use in "trainerv.ini" and it does not spawn any Turismo's anymore when I press ALT+#. Also, @sjaak327, I strongly think that having car spawns ENABLED and BINDED by default is just an unnecessary feature creep, since who wants to just randomly spawn cars with every ALT+# they use? Most people just spawn a car once from the menu directly.