Slow advancement fame / PP awards

I played a game at he weekend where I was on slow track and the party only gained one Fame. The ref put 0.5 on my sheet, but neither of us was sure if that was correct - should it have rounded down to 0?

The Season 9 guide says:

Similarly, a Pathfinder using the slow advancement track may only earn a maximum of 1 Prestige Point for completing both mission objectives: 1/2 for completing the primary mission objective and 1/2 for completing the secondary mission objective.

However, given there is no mechanic for spending 1/2 pp I am not sure how to interpret that.

eyup. .5 pp. they changed it a few years ago so that could be a thing, so that going slow wasn't as big a burden

At least you are not out for just going slow. As much as we hate it to happen, you will likely do another adventure that only 1 PP is earned. If you are going slow for that one, you would .5 and then be back to even.