How do I revert Hook 4 to the Hook 3 version?

I have much trouble using Hook 4 under MacOS Mojave 10.14.6.
How do I revert Hook 4 to the Hook 3 version?
Yours, WAKAMATSU

Sorry to hear that , @Hook8Kuni. There shouldn’t be a problem with Hookmark 4 vs. 3.

First, make a backup of your library folder, or export the database just to be sure.

Then delete Hookmark, and run Hook 3.9. The library folder is in the same spot.

Hookmark 5 is in public beta.

Dear LucB,
Thanks a lot.
BTW, where can I find Hook 3.9 dmg file?
(Thank you for sharing that with me.)
Yours, WAKAMATSU
P.S
Now, I found and got it. Thanks.

They are on Release Notes and Downloads – Hookmark.