how i can use my data and project i have on my joomleague 2.5 to joomleague 3 version is there a routine to use on the new version ?
Unfortunately there is no routine for it and there is also no official release available. but if you want to test out the 3.0.1 package then that's possible. If you have the 2.93.239.x version installed then it's relative easy to use the data you had.
- there haven't been table changes between 3.0.1 and 2.93.239 so there shouldn't be a problem
- if you did tweak you're css/modules/pages etc then do back them up.
always make a backup!