Frame interpolation with custom value

I’m trying to slow down a video but I can’t insert 1,5x, which is the slow down I need.
The options are fixed: 2x, 4x…
Is there a way to insert a custom value? Even eventering 1,5x or 1.5x manually gives 1x as result.

Do you have German keyboard layout or any other layout with comma as decimal separator?

If yes, this is the culprit.

And yes, of course it’s extremely embarrassing that Topaz haven’t solved this up to now. It’s already embarrassing to have such a fault in the first place when about every freeware coder gets this right.

I have an Italian keyboard, that means I have a “.” in the numeric keypad. But we use comma as decimal separator, the “.” is used to separate thousands, millions, billions…