I saw today that there is a 20% discount until May 21st.
I'm still waiting for the 32bit version. If I buy it today, will I be able to re-download the installer with the 32-bit version?

Directly from the product page:

 

Quote

*Note: Initially only the P3D V4 version will be released. The version for 32 bit simulators is expected to follow in May at no additional cost.

 

https://www.aerosoft.com/en/flight-simulation/prepar3d/aircraft/2381/douglas-dc-8?number=AS14363

 

We hope to get the 32 bit files next week, Then we need some testing, an installer etc.

13 minutes ago, Mathijs Kok said:

We hope to get the 32 bit files next week, Then we need some testing, an installer etc.

I understood this. I wanted to know if the installer will include both the p3dv4 and the 32-bit version. I would like to buy it right away to take advantage of the discount.

See my answer