logic: enviroment variable handling

* expanding env vars for existsens check
* expand source paths in filemanager

cmake/pre_install_linux.cmake

@@ -3,11 +3,13 @@
 set(upxPath ${CMAKE_CURRENT_LIST_DIR}/../bin/app/Release)
 message(STATUS "upx the app")
 execute_process(
+	COMMAND rm ${upxPath}/Coati_upx
 	COMMAND upx --brute ${upxPath}/Coati -o ${upxPath}/Coati_upx
 )
 
 message(STATUS "upx the trial")
 execute_process(
+	COMMAND rm ${upxPath}/Coati_trial_upx
 	COMMAND upx --brute ${upxPath}/Coati_trial -o ${upxPath}/Coati_trial_upx
 )