A instalação do template dá erro - arquivo XML não encontrad

Qdo tento instalar pelo gerenciador de extensões aparece as mensagens abaixo
Strict Standards: Only variables should be assigned by reference in C:\xampp\htdocs\ntec\plugins\system\jat3\jat3.php on line 41

Strict Standards: Declaration of JParameter::loadSetupFile() should be compatible with JRegistry::loadSetupFile() in C:\xampp\htdocs\ntec\libraries\joomla\html\parameter.php on line 512

Strict Standards: Non-static method T3Common::get_active_template() should not be called statically in C:\xampp\htdocs\ntec\plugins\system\jat3\jat3\core\define.php on line 16

Strict Standards: Non-static method JAT3_AdminUtil::get_active_template() should not be called statically in C:\xampp\htdocs\ntec\plugins\system\jat3\jat3\core\common.php on line 66

Strict Standards: Non-static method JAT3_AdminUtil::checkPermission() should not be called statically, assuming $this from incompatible context in C:\xampp\htdocs\ntec\plugins\system\jat3\jat3.php on line 161

Strict Standards: Non-static method JAT3_AdminUtil::checkCondition_for_Menu() should not be called statically, assuming $this from incompatible context in C:\xampp\htdocs\ntec\plugins\system\jat3\jat3.php on line 163

Strict Standards: Non-static method T3Common::detect() should not be called statically, assuming $this from incompatible context in C:\xampp\htdocs\ntec\plugins\system\jat3\jat3.php on line 183

Strict Standards: Non-static method T3Path::path() should not be called statically, assuming $this from incompatible context in C:\xampp\htdocs\ntec\plugins\system\jat3\jat3\core\common.php on line 52

Strict Standards: Non-static method JAT3_AdminUtil::checkCondition_for_Menu() should not be called statically, assuming $this from incompatible context in C:\xampp\htdocs\ntec\plugins\system\jat3\jat3.php on line 68

Strict Standards: Non-static method T3Common::detect() should not be called statically, assuming $this from incompatible context in C:\xampp\htdocs\ntec\plugins\system\jat3\jat3.php on line 85

Strict Standards: Non-static method T3Path::path() should not be called statically, assuming $this from incompatible context in C:\xampp\htdocs\ntec\plugins\system\jat3\jat3\core\common.php on line 52

Agora não consigo tirar essas mensagens da tela e aparece tb isto
JInstaller: :Install: Não é possível encontrar o arquivo XML de instalação
Alguém pode me ajudar por favor
obrigada

Você tem o arquivo xml com as configurações do template?

Experimente começar do zero com este arquivo:

http://blank.vc/

Bom dia, andei me deparando com esse erro há algum tempo, e hj consegui resolver, pelo menos tirar os erros da tela, ainda não sei se vou ter problemas futuros, mas já deixo aqui a solução:
Entrar no administrador, "Global Configuration", "Server", na opção "error reporting" escolha a opção "none".
Pra mim aqui funcionou legal, boa sorte
Obs.: o meu idioma esta no inglês, caso o seu esteja em pt-br use as opções traduzidas.
abraços.