Reuploaded and reinstalled 1.4.0 b2 and got blank pages...
I tried to uninstall, and... got the same blank page
After this I can see vbdownloads section in products.
No, you need to ensure it's set high enough that you can correctly import a product. It's plausible that, if it's set to 1M, that is the cause of your issues. I'm eliminating known possible causes before moving forward