Topic: TIPS. How to Update existing translations after new releases ...
You can merge your existing .po file with the empty.po (from the new release) file with msgmerge.
Or, if you are using poEdit, you can load your .po file and select 'Catalog', 'Update from pot-file'. Select All files as filter and navigate to the empty.po file and select this one.
Now the merge will take place and you see all your new strings. Translate the new strings and save your work. The .mo file is created when you save.
That is all there is
BTW. Please share the new files with us.