private isLatestInstalledVersion(version: string): boolean {
        var pathTobeChecked = this.packageType == utils.Constants.sdk ? path.join(this.installationPath, utils.Constants.relativeSdkPath) : path.join(this.installationPath, utils.Constants.relativeRuntimePath);
        if (!tl.exist(pathTobeChecked)) {
            throw tl.loc("PathNotFoundException", pathTobeChecked);
        }

        var allEnteries: string[] = tl.ls("", [pathTobeChecked]).map(name => path.join(pathTobeChecked, name));
        var folderPaths: string[] = allEnteries.filter(element => fs.lstatSync(element).isDirectory());
        var isLatest: boolean = folderPaths.findIndex(folderPath => {
            try {
                let versionFolderName = path.basename(folderPath);
                tl.debug(tl.loc("ComparingInstalledFolderVersions", version, versionFolderName));
                return utils.versionCompareFunction(versionFolderName, version) > 0;
            }
            catch (ex) {
                // no op, folder name might not be in version format
            }
        }) < 0;

        var filePaths: string[] = allEnteries.filter(element => !fs.lstatSync(element).isDirectory());
        isLatest = isLatest && filePaths.findIndex(filePath => {
            try {
                var versionCompleteFileName = this.getVersionCompleteFileName(path.basename(filePath));
                tl.debug(tl.loc("ComparingInstalledFileVersions", version, versionCompleteFileName));
                return utils.versionCompareFunction(versionCompleteFileName, version) > 0
            }
            catch (ex) {
                // no op, file name might not be in version format
            }
        }) < 0;

        isLatest ? tl.debug(tl.loc("VersionIsLocalLatest", version, this.installationPath)) : tl.debug(tl.loc("VersionIsNotLocalLatest", version, this.installationPath));
        return isLatest;
    }

    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);
        }
    }

    it("downloads nuget file as nupkg and does not extract it", (done: MochaDone) => {
        this.timeout(1000);

        let tp: string = path.join(__dirname, "L0DownloadNugetPackage_noextract.js");

        let tr: ttm.MockTestRunner = new ttm.MockTestRunner(tp);

        tr.run();

        assert.equal(tl.ls(null, [tempDir]).length, 0, "no files should be in temp folder.");

        assert.equal(tl.ls(null, [destinationDir]).length, 1, "should have only 1 file.");
        const zipPath = path.join(destinationDir, "singlePackageName.nupkg");
        const zipStats = tl.stats(zipPath);
        assert(zipStats && zipStats.isFile(), "nupkg file should be downloaded");

        assert(tr.stderr.length === 0, "should not have written to stderr");
        assert(tr.succeeded, "task should have succeeded");

        done();
    });