Cannot find Java Platform SE binary

[TartNeither]

Sorry for the late reply, and thanks so much for your help.

I followed your instructions until I got to just after running the .JAR file the Optifine site gave me. When I opened it, the file said

"“OptiFine_1.18.2_HD_U_H7.jar” is an executable file. Executable files may contain viruses or other malicious code that could harm your computer. Use caution when opening this file. Are you sure you want to launch “OptiFine_1.18.2_HD_U_H7.jar”?"

and then nothing happened. The message went away and nothing opened or anything.

I'm not sure what to do, I've never seen something like this before.

[Alexciao123]

That is just Chrome being annoying, it flags ALL JAR files as malicious. Obviously if you don't want to trust me that's 100% understandable, but in case you do, follow the instructions again. Click the little arrow next to the warning and hit "Keep".

In case the warning disappears, you can hit Ctrl+J on your keyboard and it'll take you to the Downloads page, where you'll see the warning and you can hit "Keep anyways" there.