Revert Stacks 4 pages back to Stacks 3 pages

Does anyone know how to revert Stacks4 pages back to Stacks3 pages.
I accidently opened my RW7 stacks 3 page from old computer, using RW7 stacks 4 pages.
This destroyed my pages on both systems now.
Looks to be an error from RapidCart. (see below)

If I could revert my Stacks pages; I think it would help.
Error when opening:
The Stackss plugin is too old to read this file.
This file was written with newer ersion of Stacks
Written with v4.3.0(6300)
Installed version Stacks v3.6.9(4242)

This is showing up on my pages:
/rapidcartpro/system/RCCatalog.php on line 236 Deprecated: array_uintersect(): Returning bool from comparison function is deprecated, return an integer less than, equal to, or greater than zero in /home/chucksnailcross/public_html/rw_common/plugins/rapidcartpro/system/RCCatalog.php on line 236 Deprecated: array_uintersect(): Returning bool from comparison function is deprecated, return an integer less than, equal to, or greater than zero in /home/chucksnailcross/public_html/rw_common/plugins/rapidcartpro/system/RCCatalog.php on line 236

Hi, maybe it helps you: I use RapidWeaver 8.9.4 , Stacks 5.1.2. und PapidCart Pro 5.0.4 on an M1 Mac Book Pro with Sonoma 14.4.1and PHP 8.2 on the server.
It works fine.

It does not work with RapidWeaver Classic!

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Thank you!