I reccomend checking out this thread
https://steamcommunity.com/app/438100/discussions/1/2828702373000761142/
or watching this video
https://www.youtube.com/watch?v=ruMGxyNw6kQ
I hope this is helpful !
you can export mesh as the fbx file
Window > Package Manager > Search for FBX Exporter, install it > Place .asset mesh to Hierarchy > click RMB > Export to FBX... (set export format to Binary) > Export
edit exported fbx file in blender as you wish
THE ONLY PROBLEM FBX Exporter CONVERT FILE WITHOUT SKELETON so it's useless in most cases
U need a ripper tool like AssetRipper to then Un vrca the file and then after deleting the Auxilry , Script files then you can pull it into the unity u have open and then fix up the missing scripts to then upload it
All the passwords for her avatars are a different per user who paid for them. Just head to the RipperStore's discord and go there password lock thread. maybe someone there could crack the code or remove the password on it all together