Copy ...\AndorsTrailRelease\andors-trail\AndorsTrail to a temporary directory, then delete it.
Open Android Studio, New > Import Project, select the AndorsTrail folder from the temporary location, choose ...\AndorsTrailRelease\andors-trail\AndorsTrail as target directory. Click next a few times.
It then shows some error about not finding build tools. Below it there should be the option to 'Add google Maven reposiroty and sync project'. Click that option and then 'Do Refactor' (Bottom Left).
In the newly created file 'app/build.gradle'
In line 4 change the compileSdkVersion to 30 (or higher?)
In line 9 change the minSdkVersion to 14 instead of 4
In line 22 change the version from '29.+' to '28.0.0' and the compile at the beginning to implementation
Then Click 'Sync Project with Gradle Files' (icon in top right) that should no longer give errors.
Then replace the url in the tmx files with an https version of it since it makes problems later on (Replace "http://" to "https://" with Notepad++ for all *.tmx files in subfolder XML)
After that rename all maps to .xml instead of .tmx (CMD: ren ...\AndorsTrailRelease\andors-trail\AndorsTrail\app\src\main\res\xml\*.tmx *.xml)
Edit the .ignore file
In waytogalmore0.tmx I found an issue with Lutarcs poser 'Mikhail': he doesn't spawn as he should, so there is no icon in dialogue.
And I found a more cumbersome issue in the following 12 tmx maps:
There was taken 1 or more duplicate png file, with the path ../../altered/drawable/... instead of ../drawable/... and some sprites were taken from there also.