32 to 64 bit transition

[JoeClark]

Hii...
New customer with old equipment and software has asked me to modify their existing 'server' to support more memory.
Windows 7 Ultimate machine, being used as a 'server'. Maxed at 4GB of RAM because Win7 is 32 bit. Can not install fresh, because of a custom LOB application that has no documentation, no support and an unhappy, allegedly unpaid developer.
Has anyone heard of ANY methods to positively update a 32 bit system to a 64 bit system? I know it's a long shot, but, I must at least ask, to meet the request of my customer.

Thanks!

I didn't find the right solution from the Internet.

References:-https://www.technibble.com/forums/threads/32-to-64-bit-transition.76389/

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