Is there a reason you don't want to install Bitcoin Core? You wanted "the fastest way", but that's a week ago. Unless your internet provider limits you on data, you could have been done already. It takes just over 200 GB of disk space, and if you're low on space, you can use
Prune block storage (under Settings > Options), after which it only takes a few GB.
This is still the fastest method:
3) use core to load the wallet.dat, use the console to list all addresses, import those addresses into an SPV wallet to create a watch-only wallet