async function acquireNode(version: string): Promise<string> {
    //
    // Download - a tool installer intimately knows how to get the tool (and construct urls)
    //
    version = toolLib.cleanVersion(version);
    let fileName: string = osPlat == 'win32'? 'node-v' + version + '-win-' + os.arch() :
                                                'node-v' + version + '-' + osPlat + '-' + os.arch();  
    let urlFileName: string = osPlat == 'win32'? fileName + '.7z':
                                                    fileName + '.tar.gz';  

    let downloadUrl = 'https://nodejs.org/dist/v' + version + '/' + urlFileName;

    let downloadPath: string;

    try 
    {
        downloadPath = await toolLib.downloadTool(downloadUrl);
    } 
    catch (err)
    {
        if (err['httpStatusCode'] && 
            err['httpStatusCode'] == '404')
        {
            return await acquireNodeFromFallbackLocation(version);
        }

        throw err;
    }
    
    //
    // Extract
    //
    let extPath: string;
    if (osPlat == 'win32') {
        taskLib.assertAgent('2.115.0');
        extPath = taskLib.getVariable('Agent.TempDirectory');
        if (!extPath) {
            throw new Error('Expected Agent.TempDirectory to be set');
        }

        extPath = path.join(extPath, 'n'); // use as short a path as possible due to nested node_modules folders
        extPath = await toolLib.extract7z(downloadPath, extPath);
    }
    else {
        extPath = await toolLib.extractTar(downloadPath);
    }

    //
    // Install into the local tool cache - node extracts with a root folder that matches the fileName downloaded
    //
    let toolRoot = path.join(extPath, fileName);
    return await toolLib.cacheDir(toolRoot, 'node', version);
}

async function acquireGo(version: string): Promise<string> {
    //
    // Download - a tool installer intimately knows how to get the tool (and construct urls)
    //
    let fileName: string = getFileName(version);
    let downloadUrl: string = getDownloadUrl(fileName);
    let downloadPath: string = null;
    try {
        downloadPath = await toolLib.downloadTool(downloadUrl);
    } catch (error) {
        tl.debug(error);

        // cannot localized the string here because to localize we need to set the resource file.
        // which can be set only once. vsts-task-tool-lib/tool, is already setting it to different file.
        // So left with no option but to hardcode the string. Other tasks are doing the same.
        throw (util.format("Failed to download version %s. Please verify that the version is valid and resolve any other issues. %s", version, error));
    }

    //make sure agent version is latest then 2.115.0
    tl.assertAgent('2.115.0');

    //
    // Extract
    //
    let extPath: string;
    extPath = tl.getVariable('Agent.TempDirectory');
    if (!extPath) {
        throw new Error("Expected Agent.TempDirectory to be set");
    }

    if (osPlat == 'win32') {
        extPath = await toolLib.extractZip(downloadPath);
    }
    else {
        extPath = await toolLib.extractTar(downloadPath);
    }

    //
    // Install into the local tool cache - node extracts with a root folder that matches the fileName downloaded
    //
    let toolRoot = path.join(extPath, "go");
    version = fixVersion(version);
    return await toolLib.cacheDir(toolRoot, 'go', version);
}

async function acquireDotNetCore(packageType: string, version: string): Promise<string> {
    let downloadUrls = getDownloadUrls(packageType, version);
    let downloadPath: string;

    try {
        // try primary url
        if (!!downloadUrls[0]) {
            console.log(taskLib.loc("DownloadingPrimaryUrl", downloadUrls[0]));
            downloadPath = await toolLib.downloadTool(downloadUrls[0]);
        }
    } catch (error1) {
        console.log(taskLib.loc("PrimaryUrlDownloadFailed", error1));
        try {
            // try secondary url
            if (!!downloadUrls[1]) {
                console.log(taskLib.loc("DownloadingSecondaryUrl", downloadUrls[1]));
                downloadPath = await toolLib.downloadTool(downloadUrls[1]);
            }
        } catch (error2) {
            console.log(taskLib.loc("LegacyUrlDownloadFailed", error2));
            throw taskLib.loc("DownloadFailed", packageType, version);
        }
    }

    // extract
    let extPath: string;
    console.log(taskLib.loc("ExtractingPackage", downloadPath));
    if (taskLib.osType().match(/^Win/)) {
        extPath = await toolLib.extractZip(downloadPath);
    }
    else {
        extPath = await toolLib.extractTar(downloadPath);
    }

    // cache tool
    let cachedToolName = getCachedToolName(packageType);
    console.log(taskLib.loc("CachingTool"));
    let cachedDir =  await toolLib.cacheDir(extPath, cachedToolName, version);
    console.log(taskLib.loc("SuccessfullyInstalled", packageType, version));
    return cachedDir;
}

    private async downloadAndInstall(downloadUrls: string[]) {
        let downloaded = false;
        let downloadPath = "";
        for (const url of downloadUrls) {
            try {
                downloadPath = await toolLib.downloadTool(url);
                downloaded = true;
                break;
            } catch (error) {
                tl.warning(tl.loc("CouldNotDownload", url, JSON.stringify(error)));
            }
        }

        if (!downloaded) {
            throw tl.loc("FailedToDownloadPackage");
        }

        // extract
        console.log(tl.loc("ExtractingPackage", downloadPath));
        let extPath: string = tl.osType().match(/^Win/) ? await toolLib.extractZip(downloadPath) : await toolLib.extractTar(downloadPath);

        // cache tool
        console.log(tl.loc("CachingTool"));
        let cachedDir = await toolLib.cacheDir(extPath, this.cachedToolName, this.version);
        console.log(tl.loc("SuccessfullyInstalled", this.packageType, this.version));
        return cachedDir;
    }

    public async downloadAndInstall(versionInfo: VersionInfo, downloadUrl: string): Promise<void> {
        if (!versionInfo || !versionInfo.getVersion() || !downloadUrl || !url.parse(downloadUrl)) {
            throw tl.loc("VersionCanNotBeDownloadedFromUrl", versionInfo, downloadUrl);
        }

        let version = versionInfo.getVersion();

        try {
            try {
                var downloadPath = await toolLib.downloadTool(downloadUrl)
            }
            catch (ex) {
                throw tl.loc("CouldNotDownload", downloadUrl, ex);
            }

            // Extract
            console.log(tl.loc("ExtractingPackage", downloadPath));
            try {
                var extPath = tl.osType().match(/^Win/) ? await toolLib.extractZip(downloadPath) : await toolLib.extractTar(downloadPath);
            }
            catch (ex) {
                throw tl.loc("FailedWhileExtractingPacakge", ex);
            }

            // Copy folders
            tl.debug(tl.loc("CopyingFoldersIntoPath", this.installationPath));
            var allRootLevelEnteriesInDir: string[] = tl.ls("", [extPath]).map(name => path.join(extPath, name));
            var directoriesTobeCopied: string[] = allRootLevelEnteriesInDir.filter(path => fs.lstatSync(path).isDirectory());
            directoriesTobeCopied.forEach((directoryPath) => {
                tl.cp(directoryPath, this.installationPath, "-rf", false);
            });

            // Copy files
            try {
                if (this.packageType == utils.Constants.sdk && this.isLatestInstalledVersion(version)) {
                    tl.debug(tl.loc("CopyingFilesIntoPath", this.installationPath));
                    var filesToBeCopied = allRootLevelEnteriesInDir.filter(path => !fs.lstatSync(path).isDirectory());
                    filesToBeCopied.forEach((filePath) => {
                        tl.cp(filePath, this.installationPath, "-f", false);
                    });
                }
            }
            catch (ex) {
                tl.warning(tl.loc("FailedToCopyTopLevelFiles", this.installationPath, ex));
            }

            // Cache tool
            this.createInstallationCompleteFile(versionInfo);

            console.log(tl.loc("SuccessfullyInstalled", this.packageType, version));
        }
        catch (ex) {
            throw tl.loc("FailedWhileInstallingVersionAtPath", version, this.installationPath, ex);
        }
    }