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Why not using Adobe 32bits?

its EOL right?

I don't think so, support stops for 32bits OS but Adobe 32bits doesn't seem to be deprecated.

Why not move the client up to x64 office? 32bit add-ons in Excel seem to be the only holdback in my deployments.

I've managed to fix it by changing the order of installation for the adobe reader and set it as last application. The FTA was correct. The customer still uses some legacy x86 add-ins in office....

Also 32bits is a good technical limit for the memory usage especially for RDSH.