A: No. Any valid Radmin 3.x key will work with version 3.5.2.
If you own a license for Radmin 2.2 or earlier, you cannot simply enter your old key into Radmin 3.52. The license policy explicitly states that old keys are not compatible with upgraded software. However, you may be eligible to to a 3.x key. This process depends on your purchase date and the type of license you hold. For details, you would need to contact the official Radmin support team or visit the dedicated upgrade page. radmin 352 license key updated
Activating keys requires a specific process (sometimes involving manual requests) that can be cumbersome if you are managing hundreds of endpoints without the Radmin Deployment Tool . Licensing & Support Radmin Activation radmin 352 license key updated