Password recovery

Hello again,

a couple days ago my wife found a flashdrive with a whole bunch of vacation pictures from our early days. The only problem is, theyre in a compressed folder to which apparently there is a password in order to unzip them all. I know there are programs which can recover lost passwords, but I was wondering if there was an option that didnt require money in order to get the full effect of the program.

If its not possible or reasonable that's fine, they will be casualties like many slides my parents have, but it'd be nice.

thanks in advance