How many times can I upgrade and downgrade to/from Windows 10?

On my laptop.
I had already upgraded to to Win10 from Win7 in the first 2 months of the official release.

Unfortunately because i have an older laptop, at the time I had audio driver issues in Win10. So I used the recovery tool to downgrade back Win7

Now im curious to know if perhaps my audio driver issues might have been addressed via updates.

If I upgrade to win10 again. (because the stupid notification still pops up everyday)....will i be able to downgrade again as long as its within 30 days (like last time) or not?

The answer is I have no idea. But I think there is a much better way to address the issue here.

Lets try to address the audio problem directly rather than waiting around for windows updates.

What laptop do you have?

Gateway NV5822h (or just NV58 series for short)
Core2Duo T6600, Nvidia Geforce G210M, 4gb ram

In device manager it shows 2 audio adapters
1. Intel 82801IB ICH9 - High Definition Audio [A3]
2. NVIDIA GT218 - High Definition Audio Controller

When i plugged headphones or speakers into the 3.5mm jack it would not switch to the new Audio-OUT.

I would have to manually go into playback settings and set the headphones as the default source. and vice-versa when i unplugged them as well