First of all your default File manager in Mint is Nemo, and you have to make sure to configure your
Address bar, to make the full File Path visible, instead of using the Breadcrumb Navigation.
I hope these Links help you to do that, because that is important for our next steps.
https://www.ubuntubuzz.com/2015/10/basic-guide-for-nemo-file-manager.html
https://www.youtube.com/watch?v=ff78iE7q2sE&t=685s
As next, please
do not change anything any more within your Wine Configuration Window,
underneath the Drives Tab, this looks all fine for now.
Next, here is how to find the Location to your Animation Files,
and you can do this while iStripper is running, it doesn't matter for this Task.
Bring up the POL Window, highlight again with your Mouse the iStripper Logo,
but it might be already highlighted.
Now pay attention to the left side in that Window, and you should see several options
including "Open a directory" with a Folder icon left next to it, please click on that.
Nemo should open now a new Window and should take you to this Location here,
/home/howard/.PlayOnLinux/wineprefix/vghd/drive_c/users/howard/Local Settings/Application Data/vghd/bin/
and you are now in the "bin" Folder of your iStripper installation.
Click now in your Address bar in Nemo and delete the last "/" and "bin" in it, and press Enter.
Now you are in your "vghd" Folder
/home/howard/.PlayOnLinux/wineprefix/vghd/drive_c/users/howard/Local Settings/Application Data/vghd/
and you should see only three Folders which are "bin" "data" and "models".
According to your second Screenshot your Animation Files are stored in "models" and will be always
downloaded to this Location.
Also and from what i can see on your second Screenshot too, you have plenty of space on that Disk (4 TB)
and it seems you don't have a separate Root partition on your Mint installation,
but there is no need,
at least for now! to investigate this further.
You can leave everything like it is, but there was a big Server Failure from Totem in late 2018 or early 2019
(not sure any more it's been a while) and everyone lost the Access to their Collections, including myself
while i had all my Animation Files stored in there as well.
After everything got fixed from the Team i moved my Collection to another Location on my Disk,
and since that i never ever lost the Access to my Collection any more independent from any Server
issues on the side of Totem.
I will leave it up to you, but in any case here is how to do it on your own machine.