If you are using half life 2 pirated content you gonna have to navigate to your addon dir and where your half life 2 content is and go to models and make sure to clear the following

https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=3263473601

hl2_content\models\alyx.dx80.vtx
hl2_content\models\alyx.dx90.vtx
hl2_content\models\alyx.jpg
hl2_content\models\alyx.mdl
hl2_content\models\alyx.phy
hl2_content\models\alyx.sw.vtx
hl2_content\models\alyx.vvd
hl2_content\models\alyx_animations.ani
hl2_content\models\alyx_animations.mdl
hl2_content\models\alyx_emptool_prop.dx80.vtx
hl2_content\models\alyx_emptool_prop.dx90.vtx
hl2_content\models\alyx_EmpTool_prop.jpg
hl2_content\models\alyx_emptool_prop.mdl
hl2_content\models\alyx_emptool_prop.phy
hl2_content\models\alyx_emptool_prop.sw.vtx
hl2_content\models\alyx_emptool_prop.vvd
hl2_content\models\alyx_gestures.ani
hl2_content\models\alyx_gestures.mdl
hl2_content\models\alyx_postures.ani
hl2_content\models\alyx_postures.mdl
hl2_content\models\alyxmask.dx80.vtx
hl2_content\models\alyxmask.dx90.vtx
hl2_content\models\alyxmask.mdl
hl2_content\models\alyxmask.sw.vtx
hl2_content\models\alyxmask.vvd

after you do that resubscribe to the addon and restart the game in order for it to appear as amiya if you got any more issues report it down below.