Ugdhar

What version is this for?

I would guess that you want 1.15.2 and not 1.5.2, if so, you should go redownload. If you really meant to get 1.5.2, that version is REALLY old, and not supported anymore.

I don't know how to be more clear than that, I am sorry

It means that the in-game config button does not work currently. If you need to edit a mods configuration, you will likely have to manually edit the configuration files. I would check with the mod page on curseforge for configuration information and/or author contact info for questions on how to configure their mod.

I'm guessing you're trying to install Forge? Please post the installer log, it will be in the same folder as the installer, with the same name, but end with .log

Remove Optifine and see if that helps.

Before you try following any of the tutorials suggested above, I would like to point out how important it is that you either know Java, or know a similar programming language. You will have a Bad Time trying to make mods without some programming experience, and will quickly become frustrated if you do not know basic things like extending a class or overriding a method. You will need a JDK https://adoptopenjdk.net/ (I would get the Java 8 hotspot) You will also need an IDE; Eclipse and IntelliJ IDEA are the 2 most popular. Which is "best" is subjective and personal experience. Once you have those 2 things, start googling "learn java" and/or "java tutorials". You will probably be making stupid useless little programs to begin with, but we all started there at some point. I would work on Java for at least a week, then try following one of the tutorials mentioned. If you have no clue what any of the code means, then go back to Java and keep working on it, perhaps with a focus on the things you didn't understand following the forge tutorials. You won't be making awesome mods overnight, but if you really WANT to make mods, all the information is out there, you just have to learn some stuff Of course, this is all provided you don't already know Java. I was just guessing since your original question seemed to come from an area of inexperience.

Please do not hijack someone elses thread. Create a new thread, and post relevant information to your issue, what you are trying to do, what happens (verbosely, not a summary or in your own words), and post logs/screenshots. This will give you a much better chance of getting help than adding on to someone elses thread saying "me too".

You should really try using the forums search function. It works well, and would save you lots of time, especially for commonly asked questions I did a search for "shield", and found a solution in the first 4 links. (might be more than that now that I've posted on here) Asking for help isn't bad, but give a go at finding your own solutions. The forums search and google are great , plus you don't have to wait for an answer

The very first thing you should have been asked to do is to post your debug.log. There will be an error in there telling us what is broken.

Please post the debug.log from the computer not working as intended.

LOL @ 1.12.2 being scribbled out

That's weird, because I click it and it takes me to his tutorial index:

It's a matter of preference, really. There are arguments for both sides which is better. I would pick one and try it, see how you like it, and you can always try the other if you want, heck you could even use both if you really wanted to I suppose lol. The important part is to use one, because between code completion, being able to look up class/method/field declarations with a hotkey or click, being able to get a list of all the places a method or field is called within the project, and last but definitely not least, being able to view the vanilla MC and forge sources, I can't imagine how anyone would or could mod without one!

Almost any beginning java tutorial will help. Google "beginning java tutorial", and pick any of the first ones that pop up that are not advertisements, and they will likely help. You will also need an IDE, the 2 most popular are intellij IDEA and Eclipse. It will not be easy, you will not begin right away with making mods or cool flashy java programs. You will be making a lot of lame calculators and name lookup things and console based stuff in order to learn things like syntax, keywords, classes/objects/OOP, scope, the list is too exhausting to cover here. I can promise almost every programmer here has made a bunch of a throwaway programs/code snippets, never to be used or thought of again, between when they began programming and now. It's part of the learning process! I would study and practice basic Java for at least a week. Then, look for a forge tutorial, McJty has good ones https://wiki.mcjty.eu/modding/index.php?title=YouTube-1.14. See if you understand the Java concepts being described, if not, make notes of what you don't understand, and dive back into Java tutorials. Also once you understand basic/intermediate Java, you can look at the vanilla source code, and see how they do things, for examples for your own projects. And if you have questions about forge (not basic Java), you can find answers here, you just need to post your code (get a github account if you don't have one, and learn how to use it), logs (debug.log is always a must for anything that runs but crashes/doesn't work), and a good explanation of what you are trying to do (from the end user/player perspective).

I would update Java, I think vanilla even ships with a newer version than this one

I only work with recent versions, sorry, so I won't be of any help with 1.12. 1.12 is no longer supported, you should update to a modern supported version. The LTS link at the top of every page has information on supported versions.

Well, if you don't provide more information, no one can help you. The information you have provided doesn't give ANYTHING to go on lol. Just post your build.gradle, since it's obviously broken?

I would say probably post build.gradle since that's the file it's yelling about

You need to have Java installed. If not, you can get it from https://adoptopenjdk.net/,get the Java 8 hotspot. If you do have java installed, then likely something hijacked the jar file association, google jarfix, get it and run it, and it should correct it. If you did not have java, you won't need to do this after installing java fresh.

What version is this for?

Unfortunately, I do not believe MCreator is supported here. Most of the folks here use straight up Java for making mods. You would probably have better luck asking on an MCreator forum (not sure if they have one, but they should!) It would take time, but my suggestion would be to learn Java (google "learn java" or "beginning java tutorials"), which will allow you to get the most out of forge modding.

Also, you probably want to download the forge installer, not the launcher.

Really old versions are no longer supported. Please update to a modern version (1.14.4/1.15.2) to receive support. More information on supported versions can be found in the LTS link at the top of every page.

It will be in the logs folder of your minecraft folder, which by default in Windows is %APPDATA%\.minecraft Also, to save you time and effort, make sure this is for version 1.14+, as older versions are no longer supported.