APFS to HFS+ Converter

[pckrullenbol]

I want to use the new "APFS to HFS+ Converter", but have some questions.
I have a Macbook with MacOS 10.13.6, a 250 GB SSD with 45 GB available.
Biggest folder: photos.photoslibrary: 100 GB
Biggest file: Windows10Home-disk001.vmdk: 25 GB

Do I have enough free room for the conversion?

[pckrullenbol]

I made a bootable usb-stick and started from that and then choose the conversion tool “APFS to HFS+ convertor”.
I can select my apfs-ssd and then it askes for a temperory volume “with enough” room?
In the pop-up it does not show my second internal hfs+ hdd with 100 Gb free and it does not show an external usb hdd.
When I launch the Disc Utility all these volumes are available.
What must I do to start the conversion?

I know it’s freeware but Paragon is not much of a help...

[TheNoxx]

L.S.

I downloaded APFS to HSF converter
Selected the drive
Made an recovery disk with an 32gb usb stick (new)
Then WHAT??

Quit stops the app
select volume starts over again