Issue installing legacy version of C5

Trying to install C5.6.4.0 but get this error in the log:

AH01071: Got error ‘PHP message: PHP Warning: Unknown: POST Content-Length of 253 bytes exceeds the limit of 32 bytes in Unknown on line 0\n’, referer:

ideas please?

you might want to check what your post_max_size is in your PHP configuration. 32 bytes looks pretty low - I wonder if you forgot to put “M” after the number maybe