Based on your message, here are some key points:

1. You previously used the free version of Toad Data Modeler (TDM) but were unable to successfully install it after its availability was removed.

2. The community edition you mentioned earlier is likely now known as Erwin Data Modeler, which can be downloaded from Quest's website for free or purchased with a license key that unlocks additional features and functionality.

3. If you're still looking for alternative data modeling tools beyond the freeware options available through Toad/Quest, consider exploring other software vendors such as CA (formerly known as Informatica), where they offer their own set of products including PowerDesigner which offers both free trial versions along with full licensed editions depending upon your specific needs.

4. Another option worth considering is Altova Entity Modeler Professional Edition Trial Version which provides a 30-day evaluation period allowing you to test its capabilities without any cost constraints before deciding whether or not to purchase the product outright based on factors like performance requirements, scalability expectations etcetera.

5. Finally, if none of these suggestions appeal directly enough then it might be worth exploring open-source alternatives such as MySQL Workbench that offers robust database design and development tools absolutely free under the GNU General Public License (GPLv2).

I hope this information has been helpful in identifying suitable alternatives to meet your specific needs regarding data modeling software.

Erwin data modeler license key