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Try extract it with rar. Change the end .oiv to .rar and extract to see if there is a assembly.xml. If there is none then download another one or again

You can do it yourself its pretty simple. Download paint.net and open your skin with it and use the erase tool erase everything and you got an unmarked skin

Check your game, and realtek audio if use

Paint.net for texture

Try enabling it in antivirus, firewall or turn off any malware prevention program

Send me the link of the car

Ok, then place it in there if there are no readme. If the readme doesn't give you direction then go on to the website. If the website doesn't give direction too then install in patchday14 or x64e

Yup What is your latest patchday

If the vehicle you download have a read me then follow the readme if it doesn't then read for location on the website if there are no readme or location on the website then try the latest patchday or x64e

You need zmod3 or 2 depends on your game. Gta iv is zmod2 gta v is zmod3. There are many more game that zmod support go to their website.

Launch gta with gtalaucher.exe Launcher i mean

You have to use openiv and turn on edit mode. Install in your latest patchday like patchday14 or higher. Sometimes if vehicle is require to be install in certain location then install it there. Those videos are example for you, the readme in the car files is the main thing.

Yup that is how it work

No you have to copy the line. Like if you are changing police2 then search for it and copy only that line. Tell user to copy that line a replace with the line that is already in their meta.

Change the postfx

Copy the meta the only part that you change add it to another notepad and changes it name. Remeber to tell user where and how to install. Download some files and look into it

Is it at optimal

Have you set gta v to optimal setting in geforce experience and try open nvidia control panel and change gta to using graphics driver or cpu driver or intergrate depends on you and which gives most frame. It could be one of a mod that is causing the problem

That must be customized by the creator of the vehicle

Graphics driver can sometimes damage a game so it will be best look up some video on how to downgrade. i can tell you the basics needed: - old version of driver download from official website - display driver unistall (ddu) i have experience this problem and so i erase everything about the new update and downgrade it to the pld vers wait until it release a new one

What log and what installation

Lol

Turn on edit mode if its a test the right click and select edit