No worries!
I'm sure there are a lot of appreciative people and it is very generous of you to offer your 'product' as freeware. I wish I had something like that in earlier days. The 'predictive' nature of computer programs I reckon is the most valuable advantage. When you're riding on the edge of the limits you can look ahead and know in advance exactly what you can do without breaking the rules on the next shift/charter/job.
Good on ya and keep it up!