I've had these same type of errors I can't update past .7 or install any of my extensions.
2017-08-30 22:18:29 - warning: AbanteCart core v.1.2.7 chmod() expects parameter 1 to be a valid path, string given in <b>/home/truspcom/public_html/core/lib/targz.php</b> on line <b>94</b>
2017-08-30 22:18:29 - warning: AbanteCart core v.1.2.7 file_put_contents() expects parameter 1 to be a valid path, string given in <b>/home/truspcom/public_html/core/lib/targz.php</b> on line <b>89</b>
2017-08-30 22:18:29 - warning: AbanteCart core v.1.2.7 chmod() expects parameter 1 to be a valid path, string given in <b>/home/truspcom/public_html/core/lib/targz.php</b> on line <b>94</b>
2017-08-30 22:18:29 - warning: AbanteCart core v.1.2.7 file_put_contents() expects parameter 1 to be a valid path, string given in <b>/home/truspcom/public_html/core/lib/targz.php</b> on line <b>89</b>
2017-08-30 22:18:29 - warning: AbanteCart core v.1.2.7 chmod() expects parameter 1 to be a valid path, string given in <b>/home/truspcom/public_html/core/lib/targz.php</b> on line <b>94</b>
2017-08-30 22:18:29 - warning: AbanteCart core v.1.2.7 file_put_contents() expects parameter 1 to be a valid path, string given in <b>/home/truspcom/public_html/core/lib/targz.php</b> on line <b>89</b>
etc. etc.