You don't need to sync 250 gb bitcoin chain data. If your bitcoin core normaly opens with your old wallet.dat just export your address and Private Key. Then install other wallet (Electrum for example) and import your Private Key to see balance and use your bitcoins 
I guess, even for that, he needs to download it at least till the timeline where he left using his wallet, i.e.; last year. This is what we've been yelling over here but OP seems to have probably resolved the issue maybe that's why they are not responding. The problem maybe, he doesn't really know the exact final address where he stored his coins?