After upgrading my SP315-51 laptop to SSD, I installed new fresh window using bootable pendrive as many people suggested installing fresh window instead of cloning window from hard drive. However, after installation, changing brightness feature is not available and three finger gestures are limited which is must feature for me, I was even unable to downoad acer applications that came inbuilt with my laptop except one or two (other features may also be unavailable but I couldn't wait and check as the most important basic features were missing even after trying to restore them). I tried backing up my drivers and restoring them through Windows powershell and other third party apps but this is still not solved. I also tried downloading drivers from acer driver download but to no vain, so I am just using my laptop through window in my hard disk.
[Edited the thread to add issue detail]