10.6.7 Windows 64 bit version has missing MyRocks Engine

No, it is not missing "install soname 'ha_rocksdb'" will install the storage engine plugin.

mysql> install soname 'ha_rocksdb';
Query OK, 0 rows affected, 1 warning (0.18 sec)

mysql> show warnings;
+---------+------+-----------------------------------------------------------------------+
| Level   | Code | Message                                                               |
+---------+------+-----------------------------------------------------------------------+
| Warning | 1105 | Cannot enable tc-log at run-time. XA features of ROCKSDB are disabled |
+---------+------+-----------------------------------------------------------------------+
1 row in set (0.00 sec)

mysql> create database test;
Query OK, 1 row affected (0.00 sec)

mysql> use test;
Database changed
mysql> create table t1 (i int) engine rocksdb;
Query OK, 0 rows affected (0.00 sec)

mysql> show create table t1;
+-------+----------------------------------------------------------------------------------------+
| Table | Create Table                                                                           |
+-------+----------------------------------------------------------------------------------------+
| t1    | CREATE TABLE `t1` (
  `i` int(11) DEFAULT NULL
) ENGINE=ROCKSDB DEFAULT CHARSET=latin1 |
+-------+----------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

mysql> select version();
+----------------+
| version()      |
+----------------+
| 10.6.7-MariaDB |
+----------------+
1 row in set (0.00 sec)