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zip error with upgrade 5.5.1

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I just installed C5 to a client's server and bought a theme but when installing it I received this error "There was an error unpacking your file. Perhaps you have not uploaded a valid zip file, or you do not have zip installed. on 5.5.1"
 
schmidtc63 replied on at Permalink Reply
I just had this same problem on Windows/IIS. If that's what you're using, here are the steps I took to fix it:

1. Modify php.ini and look for the line
extension=php_zip.dll
Make sure that line is not commented out.

2. Make sure the packages directory has write privileges for the IUSR_ account that's accessing your site.

3. Modify concrete\helpers\file.php. In there is a function called copyAll. Replace it with this code which simply makes sure that unix-based front slashes are replaced with windows-based back slashes:

public function copyAll($source, $target, $mode = 0777) {
      $source = str_replace('/','\\',$source); //<-- take the passed $source and replace the front slashes with back slashes for windows compatibility
      $target = str_replace('/','\\',$target); //<-- take the passed $target and replace the front slashes with back slashes for windows compatibility
      if (is_dir($source)) {
         @mkdir($target, $mode);
         @chmod($target, $mode);
         $d = dir($source);
         while (FALSE !== ($entry = $d->read())) {
            if ( $entry == '.' || $entry == '..' || substr($entry, 0, 1) == '.') {
               continue;
            }
            $Entry=str_replace('/','\\',$Entry);   //<--      
            $Entry = $source . '\\' . $entry;     //replaced forward slashed with back slashes  for windows compatibility     
            if (is_dir($Entry)) {
               $this->copyAll($Entry, $target . '\\' . $entry, $mode); //replaced forward slashed with back slashes  for windows compatibility
Viewing 15 lines of 26 lines. View entire code block.


Hope that helps.
schmidtc63 replied on at Permalink Reply
You may also have to restart IIS after modifying php.ini using:
iisreset /noforce