Hi @kishore_kumar_ ,
Yes, it can be installed. If product info is not showing the right value, most probably this means the service pack installation didn't happen properly. Once successfully installed, it show the below log lines in error.log
25.01.2020 00:22:40.264 *INFO* [Thread-1572] updater.aem-service-pkg Service [27311, [org.apache.sling.installer.api.tasks.InstallTaskFactory]] ServiceEvent UNREGISTERING
25.01.2020 00:22:40.266 *INFO* [Thread-1572] com.adobe.granite.installer.Updater Removing updater itself from installer...
25.01.2020 00:22:40.267 *INFO* [Thread-1572] com.adobe.granite.installer.Updater Waiting for service org.osgi.service.event.EventAdmin...
25.01.2020 00:22:40.267 *INFO* [Thread-1572] com.adobe.granite.installer.Updater Service org.osgi.service.event.EventAdmin is now available
25.01.2020 00:22:40.268 *INFO* [Thread-1572] com.adobe.granite.startup.impl.InstallerListener Bundle updater.aem-service-pkg (597) update is over
25.01.2020 00:22:40.268 *INFO* [Thread-1572] com.adobe.granite.installer.Updater Send event with topic com/adobe/granite/installer/updater and properties {name=updater.aem-service-pkg, wait=false, id=597}
25.01.2020 00:22:40.268 *INFO* [Thread-1572] com.adobe.granite.installer.Updater Finished updater AEM-6.4-Service-Pack-7
25.01.2020 00:22:40.268 *INFO* [Thread-1572] com.adobe.granite.installer.Updater Getting repository service...
25.01.2020 00:22:40.269 *INFO* [Thread-1572] com.adobe.granite.installer.Updater Got repository service
25.01.2020 00:22:40.269 *INFO* [Thread-1572] com.adobe.granite.installer.Updater Removing bundle at /libs/system/aem-service-pkg-6.4.8/install/1/updater.aem-service-pkg-1.0.0.jar...
25.01.2020 00:22:40.613 *INFO* [JcrInstaller.3] org.apache.sling.installer.provider.jcr.impl.JcrInstaller Removing resource from OSGi installer: [/libs/system/aem-service-pkg-6.4.8/install/1/updater.aem-service-pkg-1.0.0.jar]
25.01.2020 00:22:40.625 *INFO* [OsgiInstallerImpl] updater.aem-service-pkg BundleEvent STOPPING
25.01.2020 00:22:40.627 *INFO* [OsgiInstallerImpl] updater.aem-service-pkg BundleEvent STOPPED
25.01.2020 00:22:40.628 *INFO* [OsgiInstallerImpl] updater.aem-service-pkg BundleEvent UNRESOLVED
25.01.2020 00:22:40.628 *INFO* [OsgiInstallerImpl] updater.aem-service-pkg BundleEvent UNINSTALLED
25.01.2020 00:22:40.672 *INFO* [OsgiInstallerImpl] org.apache.sling.audit.osgi.installer Uninstalled bundle updater.aem-service-pkg [597] from resource TaskResource(url=jcrinstall:/libs/system/aem-service-pkg-6.4.8/install/1/updater.aem-service-pkg-1.0.0.jar, entity=bundle:updater.aem-service-pkg, state=UNINSTALL, attributes=[org.apache.sling.installer.api.tasks.ResourceTransformer=:30:25:, Bundle-SymbolicName=updater.aem-service-pkg, Bundle-Version=1.0], digest=1579911451353)
25.01.2020 00:22:40.672 *INFO* [FelixDispatchQueue] org.apache.felix.framework FrameworkEvent PACKAGES REFRESHED
25.01.2020 00:22:40.677 *INFO* [Thread-1572] com.adobe.granite.installer.Updater Content Package AEM-6.4-Service-Pack-8 Installed successfully
25.01.2020 00:22:40.680 *INFO* [CM Event Dispatcher (Fire ConfigurationEvent: pid=org.apache.sling.jcr.base.internal.LoginAdminWhitelist.fragment.664ea920-cf92-4701-aa4c-07230e73dc71)] org.apache.sling.jcr.base.internal.LoginAdminWhitelist WhitelistFragment removed 'bundleupdater: [updater.aem-service-pkg]'
25.01.2020 00:22:40.681 *INFO* [CM Event Dispatcher (Fire ConfigurationEvent: pid=org.apache.sling.jcr.base.internal.LoginAdminWhitelist.fragment.664ea920-cf92-4701-aa4c-07230e73dc71)] org.apache.sling.jcr.base Service [org.apache.sling.jcr.base.internal.LoginAdminWhitelist.fragment.664ea920-cf92-4701-aa4c-07230e73dc71,18614, [org.apache.sling.jcr.base.internal.WhitelistFragment]] ServiceEvent UNREGISTERING
25.01.2020 00:22:40.716 *INFO* [OsgiInstallerImpl] org.apache.sling.audit.osgi.installer Full package refreshing
25.01.2020 00:22:40.716 *INFO* [OsgiInstallerImpl] org.apache.sling.audit.osgi.installer Waiting up to 90 seconds for bundles refresh
25.01.2020 00:22:40.716 *INFO* [FelixDispatchQueue] org.apache.felix.framework FrameworkEvent PACKAGES REFRESHED
25.01.2020 00:22:40.716 *INFO* [OsgiInstallerImpl] org.apache.sling.audit.osgi.installer Done full package refresh
25.01.2020 00:22:55.190 *INFO* [oak-repository-executor-1] com.adobe.granite.repository Service [27401, [org.apache.jackrabbit.oak.api.jmx.SessionMBean]] ServiceEvent REGISTERED
You can grep for any of these lines in your error log to confirm.
Check [1] and see if there are any nodes present below. This means the installation is not complete. You can delete the node and try installing again.
[1] - system/sling/installer/jcr/pauseInstallation