Is this an error with new software? + Reverting back to an old version

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My first layers were not as good lately and I noticed when adding an object there is a small gap between the virtual build plate and bottom of object, this is on a fresh install of the latest version (1.4.2.2) with no settings changed on windows pc.......Is this normal?


Also I wanted to install an old version of the software to compare it but when I unistalled the latest version and tried to install an old one it would not complete the installation no matter what version i used, is it possible to downgrade.


many thanksĀ 

everytime you install the software it will erase the existing one. The small gap does not actually exist when printed, dont worry.