> Uninstall fusion 360 must be done (in windows) like usual other progs!
Config Panel / Uninstall Progs

Yes it should be like what you mentioned above, except the fact that it doesn't work! Windows was not able to uninstall it ;)

So, I did a research and found this:

https://knowledge.autodesk.com/support/fusion-360/troubleshooting/caas/sfdcarticles/sfdcarticles/How-to-do-a-clean-uninstall-of-Autodesk-Fusion-360.html

According to above website :

1-Go to the Start Menu > Control Panel > Uninstall Programs.
2-Select the existing Autodesk Fusion 360 entry from the list and click Uninstall.
-> *Sometimes this step will not work depending on what happened to the installation files. If that is the case move onto the manual deletion steps below)*

In my case this didn't work! So, I went to this link:

https://knowledge.autodesk.com/support/fusion-360/troubleshooting/caas/sfdcarticles/sfdcarticles/How-to-do-an-automatic-Clean-Uninstall-for-Autodesk-Fusion-360.html

and downloaded "Fusion_360_Cleaner.zip for Windows" and then executed it! It seems it was able to remove Fusion 360. But my problem is that when I go to Control Panel\All Control Panel Items\Programs and Features I still see Fusion 360 ( however the icon is not there but it says it has occupied 2.54 GB on my drive!

Edit: I just need a companion program for MOI to do the fillet job! While I am waiting for MOI to improve its filleting abilities :)
So, I am looking for a preferably lightweight and free/open source program. if you have worked with Onshape & 123D Design before which one you suggest?