I have determined that, on my home computer, there is no problem with installing “Members” and “Bitcoin and Altcoin Wallets” at the same time. However:
It seems that on your site, the plugin “Members” cannot be activated unless you first deactivate “WPFront User Role Editor”Both of these two plugins try to declare a function with the same name, members_get_capabilities(). “Members”, if installed first, does not check if the function is declared. The error message is:
Fatal error: Cannot redeclare members_get_capabilities() (previously declared in /home/satoshihost/public_html/wp-content/plugins/wpfront-user-role-editor/classes/class-wpfront-user-role-editor.php:211) in /home/satoshihost/public_html/wp-content/plugins/members/inc/functions-capabilities.php on line 306
This is a problem with “Members”, not with the other plugin.
As I am unable to reproduce the problem with Bitcoin and Altcoin Wallets, I strongly recommend that you try again to enable WordPress debugging. It is not very hard, you simply need to edit the wp-config.php file as explained here. You need to add define( 'WP_DEBUG', true );, define( 'WP_DEBUG_LOG', true );, and define( 'WP_DEBUG_DISPLAY', false );. There are good reasons why this cannot be a simple on/off button.
There are two ways to proceed:
1. If you can enable the log file, then there will be some error messages written out to the logs. Then I can get a better idea of what is going on.
2. If I had to guess, this particular plugin does something with capabilities that messes with the manage_wallets capability at runtime. If you are OK with using some other membership plugin then you should be OK.
kind regards