[TYPO3-install] Upgrade 4.3->4.5 renders backend inaccessible

[Patrick Hunziker]

  Hello
  I have upgraded on a Hosted Windows Server from Typo3 4.3 to Typo 4.5
  using FTP uploading, and then running the Install/Upgrade script, which
  went through without problems, reporting me success for each stage.
  Typo3 is installed in a subdomain, where it was before.

  Now, I can no more access the backend using
  http://www.swissnano.org/Typo3root/typo3/index.php
  (try it) because of an
  error 'file not found:
  d:/www/www674/Typo3root/\contrib/modernizr/modernizr.min.js'

  (this coorect location would be
  d:/www/www674/Typo3root/typo3/contrib/modernizr/modernizr.min.js'
  )

  However, the front end
  http://www.swissnano.org/Typo3root/index.html
  works correctly.
  Apparently, there is some problem with the backend path.
  When I do a hack and install an additional contrib/ folder at the
  location in the error report, this error disappears but another file is
  now not found, which requires another backend path.
  I tried .htaccess tricks, but no success with and without .htaccess.
  Any idea ?
  Technical details below.

  Thanks
  Pat


  ### DEBUG SYSTEM INFORMATION - START ###
  HTTP_HOST : www.swissnano.org
  TYPO3_HOST_ONLY : www.swissnano.org
  TYPO3_PORT :
  PATH_INFO :
  QUERY_STRING : TYPO3_INSTALL[type]=phpinfo
  REQUEST_URI :
  /TYPO3root/typo3/install/index.php?TYPO3_INSTALL[type]=phpinfo
  HTTP_REFERER :


 
http://www.swissnano.org/TYPO3root/typo3/install/index.php?TYPO3_INSTALL[type]=typo3conf_edit 




  TYPO3_REQUEST_HOST : http://www.swissnano.org
  TYPO3_REQUEST_URL :


 
http://www.swissnano.org/TYPO3root/typo3/install/index.php?TYPO3_INSTALL[type]=phpinfo 




  TYPO3_REQUEST_SCRIPT:
  http://www.swissnano.org/TYPO3root/typo3/install/index.php
  TYPO3_REQUEST_DIR : http://www.swissnano.org/TYPO3root/typo3/install/
  TYPO3_SITE_URL : http://www.swissnano.org/TYPO3root/
  TYPO3_SITE_SCRIPT : typo3/install/index.php?TYPO3_INSTALL[type]=phpinfo
  TYPO3_SSL :
  TYPO3_REV_PROXY :
  SCRIPT_NAME : /TYPO3root/typo3/install/index.php
  TYPO3_DOCUMENT_ROOT : d:/www/www674
  SCRIPT_FILENAME : d:/www/www674/TYPO3root/typo3/install/index.php
  REMOTE_ADDR : 145.250.209.1
  REMOTE_HOST : 145.250.209.1
  HTTP_USER_AGENT : Mozilla/5.0 (Windows NT 5.1; rv:9.0.1) Gecko/20100101
  Firefox/9.0.1
  HTTP_ACCEPT_LANGUAGE: en-us,en;q=0.5
  CONST: PHP_OS : WINNT
  CONST: TYPO3_OS : WIN
  CONST: PATH_thisScri: d:/www/www674/TYPO3root/typo3/install/index.php
  CONST: php_sapi_name: cgi-fcgi
  OTHER: TYPO3_VERSION: 4.5.10
  OTHER: PHP_VERSION : 5.2.17
  imagecreatefromgif(): 1
  imagecreatefrompng(): 1
  imagecreatefromjpeg(: 1
  imagegif() : 1
  imagepng() : 1
  imagejpeg() : 1
  imagettftext() : 1
  OTHER: IMAGE_TYPES : 15
  OTHER: memory_limit : 64m
  SERVER: SERVER_PORT : 80
  SERVER: SERVER_SOFTW: Microsoft-IIS/6.0