Hi Cheryl,
Go to https://appstore.home.mendix.com/link/modelers/
Here you'll find all downloadable modelers, going back as far as version 2.5.0.
Hi Cheryl,
You can also find Mendix version 7.18.1 in AppStore. Below is the link, where you can get till version 2.5.0 as Wiekeโ said.
https://appstore.home.mendix.com/link/modelers/
Hope this will help you.
Cheers,
Ravi