There you go:

screener #1

// prices having crossed over the Y-period HIGHEST price in the last X bars
Y  = 100
X  = 5
HH = highest[Y](high)
c1 = summation[X](close CROSSES OVER HH[1])
SCREENER[c1]

screener #2

// prices having crossed under the Y-period LOWEST price in the last X bars
Y  = 100
X  = 5
LL = lowest[Y](low)
c1 = summation[X](close CROSSES UNDER LL[1])
SCREENER[c1]

Yes, bear in mind that ProScreener still has a 254-bar limit with IG (PRT extended it to 1024 a few months ago, instead).
There you go (not tested):

Screener #1

// prices having crossed over the Y-period HIGHEST price in the last X bars
// for the first time since Y periods ago
//
Y  = 100
X  = 5
HH = highest[Y](high)
c1 = summation[X](close CROSSES OVER HH[1])
c2 = (summation[Y - X](close CROSSES OVER HH[X + 1]) = 0)
SCREENER[c1 AND c2]

Screener # 2

// prices having crossed under the Y-period LOWEST price in the last X bars
// for the first time since Y periods ago
Y  = 100
X  = 5
LL = lowest[Y](low)
c1 = summation[X](close CROSSES UNDER LL[1])
c2 = (summation[Y - X](close CROSSES UNDER LL[X + 1]) = 0)
SCREENER[c1 AND c2]

It should  scan 100 periods and check that a  crossover occurred in the last 5 periods, but NOT in the previous 95 periods.

Your example was returned or not?

It seems to be working fine  for me.