I went through the stuff in the free site, and made a list of all the stuff I found that was for 1.0 or previous. I don't know how to check dynamic clothing for compatibility, I assume it works with any version, but may be wrong. When something said it was for 1.2 (1.02?), I took it at face value without checking, I also assumed that all texture files and shader sets work for any version. Here is what I found.

character_sets:
Morphed_Antonia_124_,  by drapak12.

in character_texture_sets.
All OK.

poses:
TGPPoses01, by lesbentley.
TGPPoses02, by lesbentley.
APUtilityPoses0.9.122, by lesbentley.

hair_models:
All OK.

hair_textures:
All OK.

clothing_models:
Beach_Volleyball_Set_for_Antonia,  by  amy_aimei.

clothing_textures:
All OK.

morphs:
All OK.

smart_props:
All OK.

texture_sets:
All OK.

utilities
AntoniaPuppetMastersupport, by  SaintFox.

resources:
All OK.

In addition, there is a problem with the download link for "Beach_Volleyball_Set_for_Antonia_Updates" in the clothing_models section. "LidTest-01_cr2" in morphs, is obsolete, and can be deleted.

[edit]

I missed one, xuu4u_-_Extreme_Gym_Poses_for_Antonia"  by xuu4u, is also for 1.0.