P: ExtractPreviews script in help article always fails

The ExtractPreviews script in this help article:

https://helpx.adobe.com/lightroom-classic/kb/extract-previews-for-lost-images-lightroom.html 

doesn't work in LR 14.0.1 on Mac OS 14.6.1 or Windows 11. No matter which photos are selected, it always produces this error:

This appears in the console log when you run the script:

2024-11-24 11:54:29.038 Adobe Lightroom Classic[77127:11037041] Could not open file "/Users/john/Lightroom/cats/Test-14/Test-14 Previews.lrdata/0/062F/062F71E0-1BE7-43EA-B951-332C8CF33405-2bbfa387aba361443ffb2e579b214e8c.lrprev"
    0: field    parseMultiSectionFile          - C
    1: upvalue  ?                              - 71:134+5
    2:          [unnamed]                      - 108:205+4
    3: global   pcall                          - C
    4: method   next                           - 187:445+27
    5: upvalue  ?                              - 1438065897:158+21
    6: upvalue  ?                              - 1438065897:489+11
    7: upvalue  ?                              - 1478146055:232+7
    8:          [unnamed]                      - 1131627717:301+11
    9: global   pcall                          - C
   10:          [unnamed]                      - 1131627717:313+21
   11: method   handleResponse                 - 1131627717:526+84
   12: method   handleResponse                 - 435542093:498+14
   13:          [unnamed]                      - 435542093:442+45
   14: global   pcall                          - C
   15: method   processPendingResponses        - 435542093:549+31
   16:          [unnamed]                      - 435542093:331+6
<end>

That error message indicates that the script, though advertised as being for LR 13.3 and later, is still looking for ".lrprev" files in the pre-13.3 preview cache format.