There should be a second option “Dokany” If you haven’t unchecked the option during installation. I assume you are using a cryptomator version that is not prior dokany integration. You can also install dokany manual https://github.com/dokan-dev/dokany/releases.
To answer your question:
Therer is no other way than the one you already try to go. Copy/move your files from within the vault to a location outside the vault (which will decrypt them), then delete the remaining (encrypted) vault folders and files and then uninstall cryptomator.
Please note: uninstalling cryptomator does not have an impact to your (encrypted) vault files, so you have to delete them them manually.
If you have your vault online stored also, you can use cyberduck to access and open your vault directly, and download the decrypted files. (How do I use Cryptomator without local sync?)