You really should update your IDE. There are many new features and fixes since then.The library manager was added in 1.6.2 and is a fantastic new feature.https://www.arduino.cc/en/Guide/Libraries
If you don't link to the Manchater library and the board definition used it's going to be hard to tell.In the end, it should be able to work but if the library is ancient you might need to update it yourself.
avrdude: ser_open(): can't open device "\\.\COM1": The system cannot find the file specified.
ARDUINO 1.8.4 [21.08.2017][ide]* IDE Toolbar can now go full width on 4K display.* Environment variable LIBRARY_INDEX_URL is now correctly parsed (LIBRARY_INDEX_URL_GZ can also be optinally specified). Thanks @xardael* Added per-board generic option in config file boards.txt for disabling control of dtr+rts. Thanks @d-a-v* CLI: fixed missing "runtime.platform.path" when running without the `--board` option* Linux: fixed desktop icon not launching the IDE in certain Window Managers (thanks @herrold)* Allow setting low values for console size (correctly applies console.lines=x in preferences.txt)* Make Preference window fit 600px height displays* Fix error when renaming an unsaved, newly added file. Thanks @matthijskooijman* Added the ability to increase/decrease font size via keyboard + mouse shortcuts (Ctrl + MouseWheel)* Sketch names starting with a digit are now allowed* Serial monitor is opened on a default position if the multi-monitor setup change (this should fix cases when the serial monitor is opened outside of the visibile space)[libraries]* Fixed wrong folder name for "Adafruit Circuit Playground" library, now it can be updated cleanly.* Fixed wrong include for "RobotIRRemote", now it should not interfere anymore with the real IRRemote.