I have a webhosting plan in a host that provides softaculous apps.
When I created the website, i used the current joomla version, 1,5, and haven't upgraded since. Now i got a message saying there is an upgrade available - to 2.5 - and my softaculous control panel has a button or a shortcut do do it.
my question is: will that action reset my website into a fresh 2.5 install and I will have to insert all data I had again, or will it actually upgrade my website, with the data, plugins and modules?
Sir Joomla does not allow direct update from 1.5 to 2.5
It would be better that you make a fresh install of Joomla 2.5 and then Import your data manually.