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There is no way to make it work with P900.
qDD works only with Nikon DSLRs.

I had same problem on W10 some time back.
Uninstalling graphics drivers and installing newest ones fixed problem.

There is no installation of qDD on Windows so no icons on desktop unless you make one yourself.

Every application is run from it's folder on disk. Icons on desktop are just shortcuts/links to those applications.

No. There are no scripts in qDD. At least for now.

There is no need.
But fixed IP is better since you know the address and do not need to check it every time.

With WiFi you cannot record movies - it is written in camera manual.
Recording movies is possible only when camera is connected with USB cable.

What you are asking of is a standard bracketing in aperture priority mode.
Can be done directly from camera or in 2 ways in qDD - with a camera bracketing function or custom bracketing from qDD.

New version is always available - go to Google play store.

qDD works with D300.

v0.30.x is an old version from time when Android 6.0 did not existed.