Unable to upgrade from 1.2.6 to 1.2.7

[iron]

Hello guys!
I trying to upgrade, but get this message:
Error: Cannot locate file package.xml inside of extracted extension. Possibly extension was not extracted correctly. Check log for errors
Stuck? Not a problem. You can install extensions another way. Check this help link
Log file starts with this:
2016-05-25 1:20:12 - warning: AbanteCart core v.1.2.6 file_exists() expects parameter 1 to be a valid path, string given in <b>/home/.../AbanteCart/core/lib/targz.php</b> on line <b>78</b>
2016-05-25 1:20:12 - warning: AbanteCart core v.1.2.6 mkdir() expects parameter 1 to be a valid path, string given in <b>/home/.../AbanteCart/core/lib/targz.php</b> on line <b>79</b>
Then repeats many time this:
2016-05-25 1:20:12 - warning: AbanteCart core v.1.2.6 chmod() expects parameter 1 to be a valid path, string given in <b>/home/.../AbanteCart/core/lib/targz.php</b> on line <b>94</b>
2016-05-25 1:20:12 - warning: AbanteCart core v.1.2.6 file_put_contents() expects parameter 1 to be a valid path, string given in <b>/home/.../AbanteCart/core/lib/targz.php</b> on line <b>89</b>
And this last strings:
2016-05-25 1:20:56 - App Error: AbanteCart core v.1.2.6 Error: Cannot to find package directory after unpacking archive. in /home/.../AbanteCart/admin/controller/pages/tool/package_installer.php on line 501
2016-05-25 1:20:56 - warning: AbanteCart core v.1.2.6 file_get_contents(/home/.../AbanteCart/admin/system/temp/install//package.xml): failed to open stream: No such file or directory in <b>/home/.../AbanteCart/admin/controller/pages/tool/package_installer.php</b> on line <b>513</b>

Please help to solve it.

[Basara]

Hello.

You can try manual upgrade http://docs.abantecart.com/pages/upgrade/manual.html

Do not forgot to create backup Before upgrade 

[iron]

Hello.

You can try manual upgrade http://docs.abantecart.com/pages/upgrade/manual.html

Do not forgot to create backup Before upgrade 

Thank you, Basara!