WhatsApp Tri-Crypt app for Android can re-crypt various CRYPT formats, including the CRYPT6 and CRYPT7. So it is probably your best bet for this conversion.
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We have found one software suitable in our database for this conversion.
Google Android software - convert crypt6 to crypt7 on Android
Android app used to decrypt and convert CRYPT files
Convert from crypt6 file format
|Yes, WhatsApp Tri-Crypt (Omni-Crypt) supports crypt6 file conversion as a source file type.||Yes||No||No||No||No||No||No|
|Yes, WhatsApp Tri-Crypt (Omni-Crypt) supports crypt7 file conversion as a target file type.||Yes||No||No||No||No||No||No|
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.