Hey there! Download Act I and play it. Once you reach the end it will notify you that it will export your savegame to Act II. Then you can download Act II and play it ;)
The 1.0 update only, was for the people that had the V0.99 and didn't want to download the full Act II. The current Act II download includes V1.0.
If you prefer you can also try the remaster version I'm currently making here https://www.patreon.com/posts/guess-what-its-121939930 it's free.
Cheers!!