So I'm new to PC Minecraft and am having a few difficulties. I'm trying to download Optifine 1.14.4 the latest available download so I can apply the SEUS shader and when I go to install I get the message "you must download and start Minecraft 1.14.4 once in the official launcher". I have Minecraft installed and it has the latest version as 1.15.1 but I have vivecraft 1.14.4 installed and running. I've tried to search the problem and YouTube a solution but I haven't found anything, any suggestions on what to do??
Optifine isn't available for 1.15/1.15.1 yet so Shaders shouldn't be available unless only Shader devs have previews we don't know about, if a website says they are for 1.15/1.15.1 they are probably lying and are a mod repost site, don't trust them, 1.14.4 is the latest for Optifine and Shaders, versions are important for mods, use the required one (1.14.4 in this case) unless you know it works across multiple versions.
If you want mods that do performance for 1.15 take a look around. I know there is one for Fabric called Dynamic FPS, can't remember a Forge one right now but there probably is one.