I am new on the ksp forum, i've been playing ksp for a long time now and wanted to make some IVAs using rpm and moardv.
I looked up on google and on the ksp forum and using this thread
I found out that I have to use Unity 2019.2.2f1 and KSP Part Tools.
◄ I install Unity 2019.2.2f1 from unity's site►
◄ I deleted and installed a fresh KSP copy from steam so to not havy any issues ►
◄ I opened Unity and installed the part tools ►