fixed an issue in the GE download part of the script

install.sh

@@ -104,7 +104,7 @@ if [[ $GET_PROTON -eq 1 ]] then
         }
 
         echo "Verifying tarball $tarball_name with checksum $checksum_name..."
-        work_dir=pwd
+        work_dir="$(pwd)"
         cd "$TMP_DIR" || exit 1
         if ! sha512sum -c "$checksum_name" > /dev/null 2>&1; then
             echo "sha512 check failed. We discurage continuing with this, but we trust you [y/N]: "