54 $fetchedExtension = $this->terUtility->fetchExtension($extension->getExtensionKey(), $extension->getVersion(), $extension->getMd5hash(), $mirrorUrl);
55 if (isset($fetchedExtension[
'extKey']) && !empty($fetchedExtension[
'extKey']) && is_string($fetchedExtension[
'extKey'])) {
static returnAllowedInstallTypes()