Several issues with JUX Download

Hi,,
I've several issues with your component:
1/ the gallery slideshow dont work (4 images 500x500)
2/ when I setup "NO" for free product, the file is still available on the download page :/
3/ I'm maybe blind but where can I setup prices for files to download?
4/ I didn't understand a single thing to setup the payment process (just added the link to my paypal account in "puchase link")...
5/ there is no section dedicaced to this extension on your forum

Thanks in advance for your support

Config:
- Joomla 3.6.2
- JA Simpli from JoomlArt

HI Daniel.
Thank you for using our product.
1,2: Please give me link your site and your account of administrator via mail: huyentt@vietbrain. I will check it for you.
3,4: Our product supports the link. That will go to where you PayPal. Doesn't support setup payment process.
5. I'm sorry. I will report this issue for my boss.