RM 2.0 Error installing Beta - Fresh install

[arms]

[08-Sep-2017 10:30:38 UTC] PHP Fatal error: Class 'XF\Repository\AbstractCategoryTree' not found in D:\laragon\www\XF2\src\addons\XFRM\Repository\Category.php on line 7
[08-Sep-2017 10:30:38 UTC] PHP Stack trace:
[08-Sep-2017 10:30:38 UTC] PHP 1. {main}() D:\laragon\www\XF2\admin.php:0
[08-Sep-2017 10:30:38 UTC] PHP 2. XF::runApp() D:\laragon\www\XF2\admin.php:13
[08-Sep-2017 10:30:38 UTC] PHP 3. XF\Admin\App->run() D:\laragon\www\XF2\src\XF.php:329
[08-Sep-2017 10:30:38 UTC] PHP 4. XF\Mvc\Dispatcher->run() D:\laragon\www\XF2\src\XF\App.php:1639
[08-Sep-2017 10:30:38 UTC] PHP 5. XF\Mvc\Dispatcher->dispatchLoop() D:\laragon\www\XF2\src\XF\Mvc\Dispatcher.php:41
[08-Sep-2017 10:30:38 UTC] PHP 6. XF\Mvc\Dispatcher->dispatchClass() D:\laragon\www\XF2\src\XF\Mvc\Dispatcher.php:85
[08-Sep-2017 10:30:38 UTC] PHP 7. XF\Admin\Controller\Tools->actionRunJob() D:\laragon\www\XF2\src\XF\Mvc\Dispatcher.php:232
[08-Sep-2017 10:30:38 UTC] PHP 8. XF\Job\Manager->runQueue() D:\laragon\www\XF2\src\XF\Admin\Controller\Tools.php:105
[08-Sep-2017 10:30:38 UTC] PHP 9. XF\Job\Manager->runJobEntry() D:\laragon\www\XF2\src\XF\Job\Manager.php:76
[08-Sep-2017 10:30:38 UTC] PHP 10. XF\Job\Manager->runJobInternal() D:\laragon\www\XF2\src\XF\Job\Manager.php:122
[08-Sep-2017 10:30:38 UTC] PHP 11. XF\Job\PermissionRebuild->run() D:\laragon\www\XF2\src\XF\Job\Manager.php:166
[08-Sep-2017 10:30:38 UTC] PHP 12. XF\Permission\Builder->rebuildCombination() D:\laragon\www\XF2\src\XF\Job\PermissionRebuild.php:60
[08-Sep-2017 10:30:38 UTC] PHP 13. XF\Permission\Builder->rebuildCombinationContent() D:\laragon\www\XF2\src\XF\Permission\Builder.php:140
[08-Sep-2017 10:30:38 UTC] PHP 14. XF\Permission\Builder->getContentHandlers() D:\laragon\www\XF2\src\XF\Permission\Builder.php:146
[08-Sep-2017 10:30:38 UTC] PHP 15. XF\Permission\Builder->getContentHandler() D:\laragon\www\XF2\src\XF\Permission\Builder.php:83
[08-Sep-2017 10:30:38 UTC] PHP 16. XFRM\Permission\CategoryPermissions->__construct() D:\laragon\www\XF2\src\XF\Permission\Builder.php:114
[08-Sep-2017 10:30:38 UTC] PHP 17. XFRM\Permission\CategoryPermissions->setupBuildData() D:\laragon\www\XF2\src\XF\Permission\AbstractContentPermissions.php:21
[08-Sep-2017 10:30:38 UTC] PHP 18. XFRM\Permission\CategoryPermissions->setupBuildTypeData() D:\laragon\www\XF2\src\XF\Permission\AbstractContentPermissions.php:48
[08-Sep-2017 10:30:38 UTC] PHP 19. XFRM\Permission\CategoryPermissions->getContentTree() D:\laragon\www\XF2\src\XF\Permission\TreeContentPermissions.php:23
[08-Sep-2017 10:30:38 UTC] PHP 20. XF\Mvc\Entity\Manager->getRepository() D:\laragon\www\XF2\src\addons\XFRM\Permission\CategoryPermissions.php:33
[08-Sep-2017 10:30:38 UTC] PHP 21. class_exists() D:\laragon\www\XF2\src\XF\Mvc\Entity\Manager.php:237
[08-Sep-2017 10:30:38 UTC] PHP 22. spl_autoload_call() D:\laragon\www\XF2\src\XF\Mvc\Entity\Manager.php:237
[08-Sep-2017 10:30:38 UTC] PHP 23. Composer\Autoload\ClassLoader->loadClass() D:\laragon\www\XF2\src\XF\Mvc\Entity\Manager.php:237
[08-Sep-2017 10:30:38 UTC] PHP 24. Composer\Autoload\includeFile() D:\laragon\www\XF2\src\vendor\composer\ClassLoader.php:322
[08-Sep-2017 10:30:38 UTC] PHP 25. include() D:\laragon\www\XF2\src\vendor\composer\ClassLoader.php:444

Running Laragon on windows;

 

[Mike]

That would appear to indicate you're either missing core files from the package or you're trying to install on a developer preview, not the beta.