Software requirements for commercial games

Development Audio
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1

I am using these softwares:
Autodesk maya
Substance painter
Megascans
Speedtree

I heard that just before the publishing of the game you could buy/get the commercial subscriptions and there would be no problem, if you did all of the assets/textures/materials in the student/free versions but I am not sure. Do I need to buy/get the proper sub. From the start or can I do it a few months before launch?

For example: I have the freelancer subscription, and just before launch I upgrade to indie subscription
Or I have the student version, I do all of my game assets here, and before launch I buy the software?
Thanks in advance

2

i would check with those companies. ask on their forums or email them. this question is unrelated to the unreal engine.

3

Name a free software application you can use to convert an audio file into a format that Unreal will accept.