251792 php4 to php5

I have about 4 to 5 prozilla scripts that run only on php4 -- i need them converted to php5 but some parts are encrypted, not sure what was used to encrypt. I have been a reseller of them for years and worried now that some older sites will no longer worked if not update. Need someone familiar with prozilla scripts. Please make bid per script as not sure exactly i need redone