Here's my fixing up of it: main.js

async function getLatestRelease(repo) {
    const response = await fetch(`https://api.github.com/repos/${repo}/releases/latest`);
    const data = await response.json();
    return data.tag_name;
}

function downloadFile(url, filename) {
    const link = document.createElement('a');
    link.href = url;
    link.download = filename;
    document.body.appendChild(link);
    link.click();
    document.body.removeChild(link);
}

async function showPopup(type) {
    let popupText = '';
    let downloadLink = '';

    if (type === 'dev') {
        popupText = 'Thank you for downloading Comp_V3 *dev*! This download link goes to the Github API. This is the source code. <br> <br> You will need my Custom SDK to use this. Check out my other download in the navbar.';
        downloadLink = 'https://github.com/RanchoDVT/Comp-V5/archive/refs/heads/dev.zip';
        document.getElementById('popup-title').innerText = 'Download Comp-V3 ' + type;
    } else if (type === 'stable') {
        const latestTag = await getLatestRelease('RanchoDVT/Comp-V5');
        popupText = 'Thank you for downloading Comp_V3 stable! This download link goes to the Github API. This is the source code. <br> <br> You will need my Custom SDK to use this. Check out my other download in the navbar.';
        downloadLink = `https://github.com/RanchoDVT/Comp-V5/archive/refs/tags/${latestTag}.zip`;
        document.getElementById('popup-title').innerText = 'Download Comp-V3 ' + type + ' ' + latestTag;
    } else if (type === 'sdk') {
        const latestTag = await getLatestRelease('RanchoDVT/Vex-SDK');
        popupText = 'Thank you for downloading my custom SDK. This is unofficial and in no way affiliated, endorsed, supported, or created by VEX Robotics. <br> <br> You will need this to install my Custom SDK (This) to use my Comp_V3 Program. This modifies Vex\'s robotics extension, so PLEASE don\'t go to them if you have problems with this. Please contact me. <br> <br>There is a PowerShell script for this to make it easier: ';
        popupText += '<a href="https://minhaskamal.github.io/DownGit/#/home?url=https://github.com/RanchoDVT/Vex-SDK/blob/dev/Vex-SDK.updater.ps1">Powershell download</a>';
        document.getElementById('popup-title').innerText = 'Download Custom ' + type + ' ' + latestTag;
        downloadLink = `https://github.com/RanchoDVT/Vex-SDK/archive/refs/tags/${latestTag}.zip`;
    }

    document.getElementById('popup-text').innerHTML = popupText; // Use innerHTML to render HTML content
    document.getElementById('download-link').href = downloadLink;
    document.getElementById('popup').classList.add('active');
    document.getElementById('overlay').classList.add('active');
}


function hidePopup() {
    document.getElementById('popup').classList.remove('active');
    document.getElementById('overlay').classList.remove('active');
}

the navbar:

    <nav>
        <li><a class="nav-link" data-page="index.html" href="index.html">Home</a></li>
        <li class="dropdown">
            <a class="nav-link" data-page="projects.html" href="projects.html">Projects</a>
            <div class="dropdown-content">
                <a target="_blank" href="https://github.com/Voidless7125/Comp-V5">Comp V3</a>
                <a target="_blank" href="https://github.com/RanchoDVT/Vex-SDK">Custom SDK</a>
                <a target="_blank" href="https://ranchodvt.github.io/Comp-V5/">This website!</a>
            </div>
        </li>
        <li class="dropdown">
            <a class="nav-link">Downloads</a>
            <div class="dropdown-content">
                <a onclick="showPopup('stable')">Comp_V3 Stable</a>
                <a onclick="showPopup('dev')">Comp_V3 Dev</a>
                <a onclick="showPopup('sdk')">Custom SDK Stable</a>
            </div>
        </li>
        <li><a class="nav-link" data-page="features.html" href="features.html">Features</a></li>
        <li><a class="nav-link" data-page="contact.html" href="contact.html">Contact</a></li>
        <li style="float: right;"><a class="nav-link" data-page="about.html" href="about.html">About</a></li>
    </nav>

    <!-- Pop-Up Structure -->
    <div id="popup" class="popup">
        <div class="popup-header">
            <h2 id="popup-title">Download</h2>
        </div>
        <p id="popup-text"></p>
        <button class="cancel-btn" onclick="hidePopup()">Cancel</button>
        <a id="download-link" class="download-btn" href="#" download>Download</a>
    </div>
    <div id="overlay" class="overlay" onclick="hidePopup()"></div>

and the css:

.popup {
    display: none;
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 400px;
    border: 1px solid #ccc;
    padding: 20px;
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    border-radius: 8px;
}

.popup.active {
    display: block;
    background-color: black;
}

.popup-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    background-color: black;
}

.popup-header h2 {
    margin: 0;
    font-size: 18px;
    background-color: black;
}

.download-btn, .cancel-btn {
    display: inline-block;
    margin-top: 10px;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.download-btn {
    background-color: #4CAF50;
    color: white;
    text-decoration: none;
    text-align: center;
}

.cancel-btn {
    background-color: #f44336;
    color: white;
}

.overlay {
    display: none;
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
}

.overlay.active {
    display: block;
}