Hashcat Legacy will not support PMKIDs so you will need to fallback to hccaps which have a potential of failing.
You will need to use aircrack to convert your capture files.
aircrack-ng -J HCCAP_FILE CAP_FILE.CAP
https://hashcat.net/files/hashcat-2.00.7z
extract the 7z.
cd hashcat-2.00
./hashcat-cli64.bin -m 2500 -a 0 xxx.hccap wordlist.txt
I'd also check if version 3.xx may work which atleast makes use of hccapx but still no PMKIDs
https://hashcat.net/ ---scroll to the verrrrry bottom----
You will need to use aircrack to convert your capture files.
aircrack-ng -J HCCAP_FILE CAP_FILE.CAP
https://hashcat.net/files/hashcat-2.00.7z
extract the 7z.
cd hashcat-2.00
./hashcat-cli64.bin -m 2500 -a 0 xxx.hccap wordlist.txt
I'd also check if version 3.xx may work which atleast makes use of hccapx but still no PMKIDs
https://hashcat.net/ ---scroll to the verrrrry bottom----