Today it was forced to upgrade my joomla 1.5.15 to 2.5.6 version, so i write step by step my install history.
Do buckup of your site in case you get "white screen". i dont take any responsibility for your actions. Only you do. Sooo good luck to you.
One big notice: Your current template of 1.5 will not be compatible with 2.5! You will need to update it else get new one for 2.5.
Here how i made it:
1) Upgrading Joomla from 1.5.15 to 1.5.16 by downloading zip file, uzipiing it, copying, pasting into project folder.
2) Upgrading Joomla from 1.5.16 to 1.5.17 by downloading zip file, uzipiing it, copying, pasting into project folder.
3) Upgrading Joomla from 1.5.17 to 1.5.18 by downloading zip file, uzipiing it, copying, pasting into project folder.
4) Upgrading Joomla from 1.5.18 to 1.5.19 by downloading zip file, uzipiing it, copying, pasting into project folder.
5) Upgrading Joomla from 1.5.19 to 1.5.20 by downloading zip file, uzipiing it, copying, pasting into project folder.
6) Upgrading Joomla from 1.5.20 to 1.5.21 by downloading zip file, uzipiing it, copying, pasting into project folder.
7) Upgrading Joomla from 1.5.21 to 1.5.22 by downloading zip file, uzipiing it, copying, pasting into project folder.
8) Upgrading Joomla from 1.5.22 to 1.5.23 by downloading zip file, uzipiing it, copying, pasting into project folder.
9) Upgrading Joomla from 1.5.23 to 1.5.24 by downloading zip file, uzipiing it, copying, pasting into project folder.
10) Upgrading Joomla from 1.5.24 to 1.5.25 by downloading zip file, uzipiing it, copying, pasting into project folder.
11) Upgrading Joomla from 1.5.25 to 1.5.26 by downloading zip file, uzipiing it, copying, pasting into project folder.
12) Register on http://redcomponent.com to get access to jUpgrade plugin
13) Download jUpgrade installer as zip file, install it from extension manager.
14) Activate "mootools" from plugin manager. ( It is already installed; So all you need to do is activate it )
15) Go to jUpgrade, press "start upgrade" it. Wait.
If it stucks on "Checking and cleaning..." read 16 steps;
else skip to 17.
16.a) If you upgrading on your PC server go to your php folder and find php.ini and find #extension=php_curl.dll and uncomment it - delete "#"
16.b) If you upgrading on hosting where your site is, people suggests to add 0777 chmod for "jupgrade" folder in your root directory
17) If you stuck at "Error: zip file was not successfully downloaded":
17.a) Check if folder jupgrade exists.
17.b) Go to google and search for "Joomla 2.5";
Download latest version;
Copy zip file to "jupgrade" folder in your root folder and extract it there.
Open JUpgrade and go to settings;
Near "skip download" select yes;
Near "skip decompress" select yes.
Try to upgrade again.
18) Finish.
Support our help with flatter.
Thanks
