Copying over the findings from the other post to help anyone who lands here.
It seems, your initial installation of Reader 10.0.1 was a localized Reader Installation (i.e. a specific Language Reader and not a MUI Reader). Whereas the subsequent 10.1.2 installation was a MUI Reader Installation, which in turn replaced the existing Reader installation (since the 2 are totally different products with different Product Codes) and hence, a successful installation at the time.
However, when you are trying to install the MUI Reader 10.1.3 AIP on the same system, since an existing MUI installation is already present on the system (which is not recommended while installing via an AIP package) you are now getting an error as expected. There doesnt seem to be any issue with the installer as such, but there seems to be a conflict with the current system state(s).
You may try and:
1. Uninstall all Reader installations via SCCM.
2. Chose on the product to be installed across all systems i.e. a MUI reader or a localized Reader and install the base version for the same (i.e. 10.1.0 for Localized Reader OR 10.0.0 for MUI readers)
3. Now simply push the latest quarterly updates (i.e. MSPs) via SCCM without having to go through the process of creating an AIP everytime.
Hope this helps.
How will it work when 10.2 is released?
Assuming that you have:
1. Uninstalled all prior installations and
2. Installed MUI Reader or Localized Reader on all the systems.
3. Using SCCM/SMS to push out updates.
The 10.2 update would also function normally, without any issues.
1. A Localized Reader 10.2 (most probably a full installer) would uninstall the Previous localized installation of Reader and install a fresh copy of Reader 10.2
2. A MUI Reader 10.1.2 patch would update the current MUI Reader installation on the system upto 10.2 without uninstalling the current installations.