Backup at least you config dir (if not overridden by a VSLICKCONFIG env.var it's somewhere in the 'Docs'n Settings').
If you modified some product macros also backup the 'macros' dir (in Slick install dir) to reload'em later.
Install Slick -> exit Slick -> install the backup -> start Slick and pray ... but should work.
(Reload your modified macros after installing them again to the 'macros' dir.)
Good luck,
HS2