the horus heresy has remained in 7th edition and will be continuing using 7th for the foreseeable future as the FW design team stated that they prefer complexity and depth of 7th for the horus heresy. if you wish to use solar auxilia models in 8th you would be best off proxying them as imperial guard as they never received any proper 40k rules (only 30k rules) and so are very unlikely to receive any for 8th edition 40k given that they no longer exist in the 41st millennium.
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