1. Since 0.11, many code changes, early events, visuals, and story sequences have been tweaked significantly.
2. Even if you have a save from 0.11, trying to load it on 0.14.5 may not work, due to variables and other code being altered.
3. If you do not have a save file from 0.11, it might be best to simply restart from the beginning and play through. You will definitely see vastly improved visuals, some events that have all new replacement dialogue, and other things... You can probably hold down the SKIP button if you don't want to replay fully.
4. ALL the 0.11 content is still there, only improved as described above. So you won't be missing anything by replaying.