I wanted to use a widget which is available in version 7.23.12 but I did my project in 8.10.1 . How can I change my project from version 8 to 7 ?
You should be able to use a widget created in an older Mendix version with a new one. It can be possible, that it wouldn’t run as expected, but you should be able to plug it in. You are not able to import a higher version to a lower one.