Try it and see what happens. Often the maximum on prebuilts isn’t the maximum that the hardware will support. My last laptop claimed 32gb maximum ram but works fine with 8+32gb. Just be aware that it might not work and have an option to return or sell the ram on if it doesn’t.
Edit: frequently on older hardware the memory controller can’t address more than a stated maximum amount of memory. This hasn’t really been an issue for a while, but like others mentioned you might not be able to see or use memory beyond that limit. Or the machine will just fail to POST. Always test unsupported memory configurations overnight (at least) with something like memtest86 before trusting them with any important data.