1) Effekseer Version:
On the Effekseer Website, the most recent version is 1.52g which is recommended. However, you can use any of the older version if you choose. As per tea's post below, you only have to mention your version if you're using an older version of the program.
2) File Placement for textures/sounds:
Make sure to keep all your sounds and textures used in your animation in one folder together and save your animation project file in that folder as well. This will ensure no folder tracking issues, and make it easy to .zip up to submit, and easy for the judges to unzip and play.
3) Submitting Multiple Entries
Submit each entry separately, do not group them into one submission, they will be judged separately. A reminder anyone may submit 3 entries max.