[install] use wget on 3.2 release, adapt folder check

scripts/install.sh

@@ -46,17 +46,17 @@ echo "(1/4) Downloading supplementary files (test script & cmake.opts). Make sur
 echo "**************************************************************************************************************"
 
 # make a new folder containing everything
-mkdir $(pwd)/dumux
-cd dumux
+mkdir $(pwd)/DUMUX
+cd DUMUX
 
 # download the test script and the cmake.opts
 if [ ! -f "test_dumux.sh" ]; then
-    wget https://git.iws.uni-stuttgart.de/dumux-repositories/dumux-course/raw/master/scripts/test_dumux.sh
+    wget https://git.iws.uni-stuttgart.de/dumux-repositories/dumux-course/raw/releases/3.2/scripts/test_dumux.sh
 fi
 chmod +x test_dumux.sh
 
 if [ ! -f "cmake.opts" ]; then
-    wget https://git.iws.uni-stuttgart.de/dumux-repositories/dumux-course/raw/master/cmake.opts
+    wget https://git.iws.uni-stuttgart.de/dumux-repositories/dumux-course/raw/releases/3.2/cmake.opts
 fi
 
 if [ $? -ne 0 ]; then
@@ -109,7 +109,9 @@ if [ ! -d "dumux" ]; then
     git clone -b releases/3.2 https://git.iws.uni-stuttgart.de/dumux-repositories/dumux.git
 else
     echo "Skip cloning dumux because the folder already exists."
+    cd dumux
     git checkout releases/3.2
+    cd ..
 fi
 
 # dumux-course
@@ -117,7 +119,9 @@ if [ ! -d "dumux-course" ]; then
     git clone -b releases/3.2 https://git.iws.uni-stuttgart.de/dumux-repositories/dumux-course.git
 else
     echo "Skip cloning dumux-course because the folder already exists."
+    cd dumux-course
     git checkout releases/3.2
+    cd ..
 fi
 
 if [ $? -ne 0 ]; then