Edit for Valheim Plus*****
A lot of you have been asking about valheim plus, Which I dont use, I noticed ODINS WOLF has left instructions that I have marked as the answer to this post


****Original****
The new update caused BepInEx to become incompatible, as you may have noticed by Valheim not loading, and receiving a unity crash box with an explanation point in the center.

BepInEx has already updated to be compatible with the new version

Follow the link to find the latest version of BepInEx:
https://valheim.thunderstore.io/package/denikson/BepInExPack_Valheim/



BEFORE you install, there is one easy way to transfer all of your mods without reinstalling them, Only BepInEx needs reinstalled (technically its a new, separate file, probably for compatibility reasons)

Go into your Valheim folder, then into BepIn

Copy your entire Pulgins, and Config folder to a location of your choice (I chose to temporarily place them on the desktop)

Follow the installation instructions for BepInEx, usually extracting with a program of your choice. There is a README in the folder. That will tell you where to place the files. NOTE: That it would be wise to do a full uninstall and reinstall before installing the new version. This will avoid any new and leftover files interacting in ways they shouldn't

Once that is installed go back into the Valheim game folder, place your copied Config and Plugins folders into the BepIn folder and replace the files.