Use free tools, they are more flexible

First use
rar2john from John The Cracker jumbo package to get the hashes. With the hashes listed in a file you can start cracking them with
john or
hashcat .
In your case the "Wordlist + Rules" option is needed:
c Capitalize the first letter and lower the rest
Google for a good dictionary or use those from SecLists.
More:
Code:
https://hashcat.net/wiki/doku.php?id=rule_based_attack
https://hashcat.net/wiki/doku.php?id=hashcat
https://github.com/danielmiessler/SecLists/tree/master/Passwords
Regarding "50% of the files contain a file which name contains this password.", you can create a list of them using easy bash script like:
Quote:
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for i in $(ls | grep .rar); do unrar l $i | grep "*" | awk '{ print $6}'; done
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